Office: ARL-101

Phone: +90 312 290 8077

eMail: aydinli[at]fen.bilkent.edu.tr

Professor, Ph.D.: Condensed Matter Physics, University of Virginia, 1981

Web Site

Raman and photoluminescence in compound semiconductor structures, physics of nanostructures, physics and technology of optoelectronic devices, surface physics, beam-solid interactions.

Selected Publications

• S. Balci, E. Karademir, C. Kocabas, and A. Aydinli, “Direct imaging of localized surface plasmon polaritons”, Optics Letters vol. 36, Issue 17, pp. 3401-3403 (2011)
• S. Balci, A. Kocabas, C. Kocabas and A. Aydinli, “Localization of surface plasmon polaritons in hexagonal arrays of Moiré cavities”, Appl. Phys. Lett. 98, 031101 (2011)
• S. Balci, A. Kocabas, C. Kocabas, A. Aydinli, “Slowing surface plasmon polaritons on plasmonic coupled cavities by tuning grating grooves,” Applied Physics Letters, vol. 97, pp. 131103-1–3 (2010) (PDF)
• S. Balci, M. Karabiyik, A. Kocabas, C. Kocabas, A. Aydinli, “Coupled Plasmonic Cavities on Moire Surfaces,” Plasmonics, vol. 5, pp. 429-436 (2010)
• P. Basa, P. Petrik, M. Fried, A. Dana, A. Aydinli, S. Fossi, T.G. Finstad, “Spectroscopic Ellipsometric Study of Ge Nanocrystals Embedded in SiO₂ Using Parametric Models,” Physica Status Solidi A, vol. 5, pp. 1332-1336 (2009)
• A. Kocabas, S.S. Senlik, A. Aydinli, “Slowing Down Surface Plasmons on a Moire Surface,” Physical Review Letters, vol. 102, pp. 063901-1–4 (2009)
• S. Olcum, A. Kocabas, G. Ertas, A. Atalar, A. Aydinli, “Tunable surface plasmon resonance on an elastomeric substrate,” Optics Express, vol. 17, pp. 8542-8547 (2009) (PDF)
• S.S. Senlik, A. Kocabas, A. Aydinli, “Grating based plasmonic band gap cavities,” Optics Express, vol. 17, pp. 15541-15549 (2009) (PDF)
• I.B. Akca, A. Dana, A. Aydinli, M. Rossetti, L. Li, A. Fiore, N. Dagli, “Electro-Optic and Electro-absorption characterization of InAs quantum dot waveguides,” Optics Express, vol. 16, pp. 3439-3444 (2008) (PDF)
• I.B. Akca, A. Dana, A. Aydinli, R. Turan, “Comparison of Electron and Hole Charge-Discharge Dynamics in Germanium Nanocrystal Flash Memories,” Applied Physics Letters, vol. 92, pp. 052103-1–3 (2008) (PDF)

Department Chairperson

Administrative Staff

Fatma Gül  Akça, Administrative Assistant

• Phone: 1207
• Room: SA 215a

Technical Staff

Murat Güre, Research Laboratory Technical Administrator

• Phone: 1968
• Room: ARL-103

Saadettin Karateke, Education Laboratory Technician

• Phone: 1271
• Room: SAZ06

Ergün Karaman, Research Laboratory Technician

• Phone: 1968
• Room: ARL-103

Office: SA-228

Phone: +90 312 290 1316 or 1207

eMail: yalabik[at]fen.bilkent.edu.tr

Professor, Ph.D.: Condensed Matter Physics, Brown University, 1976

Web Site

Statistical mechanics: dynamics of phase transitions and critical phenomena, quantum mechanical simulation of electronic devices.

Selected Publications

• C. Yalabik, “Nonlinear Schrodinger Equation for quantum computation,” Modern Physics Letters B, vol. 20, pp. 1099-1106 (2006)
• S. Taneri, C. Yalabik, “Finite size effects in cooperative molecular motors,” Physica A, vol. 337, pp. 291-303 (2003)
• S. Taneri, C. Yalabik, “Deformation in cooperative molecular motors,” European Physical Journal B, vol. 22, pp. 403-406 (2001)
• E. Kececioglu, M.C. Yalabik, “Time-dependent study of bistability in resonant-tunneling structures,” Physical Review B, vol. 59, pp. 2111- (1999)
• G.B. Akguc, M.C. Yalabik, “Hard spin mean field theory of three-dimensional stacked-triangular-lattice system,” Physical Review E, vol. 51, pp. 2636-2639 (1995)
• M.C. Yalabik, M.I. Ecemis, “A numerical implementation of absorbing and injecting boundary conditions for the time-dependent Schrodinger equation,” Physical Review B, vol. 51, pp. 2082-2086 (1995) (PDF)
• A. Kabakcioglu, A.N. Berker, M.C. Yalabik, “Closed form solutions and free energy of hard-spin mean-field theory of a fully frustrated system,” Physical Review E, vol. 49, pp. 2680-2683 (1994)
• M.C. Yalabik, “Electronic transport through a kink in an electron waveguide,” IEEE Trans on Elec Devices, vol. 41, pp. 1843-1847 (1994)

Office: ARL Z02

Phone: +90 312 290 8079

eMail: giovanni.volpe[at]fen.bilkent.edu.tr

Group Webpage

Selected Publications

• Simulation of the active Motion of a Microswimmer Giorgio Volpe, Sylvain Gigan & Giovanni Volpe Am. J. Phys. 82, 659-664 (2014)
• Brownian Motion in a Speckle Light Field: Tunable Anomalous Diffusion and Selective Optical Manipulation Giorgio Volpe, Giovanni Volpe & Sylvain Gigan Sci. Rep. 4, 3936 (2014)
• Stratonovich-to-Itô transition in noisy systems with multiplicative feedback Giuseppe Pesce, Austin McDaniel, Scott Hottovy, Jan Wehr & Giovanni Volpe Nature Commun. 4, 2733 (2013)
• Optical trapping and manipulation of nanostructures Onofrio M. Maragò, Philip H. Jones, Pietro G. Gucciardi, Giovanni Volpe & Andrea C. Ferrari Nature Nanotech. 8, 807-819 (2013)
• Sorting of Chiral Microswimmers Mite Mijalkov & Giovanni Volpe Soft Matter 9, 6376-6381 (2013)
• Circular motion of asymmetric self-propelling particles Felix Kümmel, Borge ten Hagen, Raphael Wittkowski, Ivo Buttinoni, Giovanni Volpe, Hartmut Löwen & Clemens Bechinger Phys. Rev. Lett. 110, 198302 (2013)
• Simulation of a Brownian particle in an optical trap Giorgio Volpe & Giovanni Volpe Am. J. Phys. 81, 224-230 (2013)

Office: SA-217

Phone: +90 312 290 2109

eMail: sebastian.wuster[at]bilkent.edu.tr

Assistant Professor, Ph.D.: Australian National University, 2007

Web Site

Ultracold gases, complex systems, quantum simulation, energy transport, Rydberg atoms, Bose-Einstein condensates.

Selected Publications

• R. Mukherjee, C. Ates, W. Li and S. Wüster, “Phase-Imprinting of Bose-Einstein Condensates with Rydberg Impurities”, Phys. Rev. Lett. 115, 040401 (2015).
• D. Schönleber, A. Eisfeld, M. Genkin, S. Whitlock, S. Wüster, “Quantum Simulation of Energy Transport with Embedded Rydberg Aggregates”, Phys. Rev. Lett. 114, 123005 (2015).
• K. Leonhardt, S. Wüster and J. M. Rost, “Switching exciton pulses through conical intersections”, Phys. Rev. Lett. 113, 223001 (2014).
• S. Wüster, B. J. Dabrowska-Wüster and M. J. Davis, “Macroscopic Quantum Self-Trapping in Dynamical Tunneling”, Phys. Rev. Lett. 109, 080401 (2012).
• S. Wüster, A. Eisfeld and J. M. Rost, “Conical intersections in an ultracold gas”, Phys. Rev. Lett. 106, 153002 (2011).
• S. Wüster, C. Ates, A. Eisfeld and J. M. Rost, “Newton’s Cradle and Entanglement Transport in a Flexible Rydberg Chain”, Phys. Rev. Lett. 105, 053004 (2010).

Office: SA-226

Phone: +90 312 290 1591

eMail: tanatar[at]fen.bilkent.edu.tr

Professor, Ph.D.: Condensed Matter Physics, University of Delaware, 1987

Web Site

Theory of quantum solids and liquids, low dimensional electron systems, computational physics.

Selected Publications

• V. Moldeveanu, B. Tanatar, “Tunable spin currents in a biased Rashba ring,” Physical Review B, vol. 81, pp. 035326 (2010)
• V. Moldoveanu, B. Tanatar, “Inelastic transitions and counterflow tunneling in double-dot quantum ratchets,” Physical Review B, vol. 82, pp. 205312 (2010)
• V. Moldoveanu, B. Tanatar, “Spin splitter regime of a mesoscopic Rashba ring,” Physics Letters A, vol. 375, pp. 187-191 (2010)
• A.L. Subasi, S. Sevincli, P. Vignolo, B. Tanatar, “Dimensional crossover in two-dimensional Bose-Fermi mixtures,” Laser Physics, vol. 20, pp. 683-693 (2010)
• A.L. Subasi, P. Pieri, G. Senatore, B. Tanatar, “Stability of Sarma phases in density imbalanced electron-hole bilayer systems,” Physical Review B, vol. 81, pp. 075436 (2010)
• M. Tas, B. Tanatar, “Plasmonic contribution to the van der Weals energy in strongly interacting bilayers,” Physical Review B, vol. 81, pp. 115326-1–7 (2010)
• R. Asgari, T. Gokmen, B. Tanatar, M. Padmanabhan, M. Shayegan, “Effective mass suppression in a ferromagnetic two-dimensional electron liquid,” Physical Review B, vol. 79, pp. 235324-1–4 (2009)
• I.N. Askerzade, B. Tanatar, “Anisotropy of Critical Fields in MgB2: Two-Band Ginzburg-Landau Theory for Layered Superconductors,” Communications in Theoretical Physics, vol. 51, pp. 563-569 (2009)
• V. Oldoveanu, B. Tanatar, “Coulomb drag in parallel quantum dots,” Europhysics Letters, vol. 86, pp. 67004-1–6 (2009)
• V. Moldoveanu, I.V. Dinu, B. Tanatar, “Fano effect in a double T-shaped interferometer,” European Physical Journal B, vol. 67, pp. 231-238 (2009)

Office: NANOTAM

Phone: +90 312 290 1966

eMail: ozbay[at]bilkent.edu.tr

Professor, Ph.D.: Electrical Engineering, Stanford University, 1992

Web Site

Metamaterials and left-handed materials, photonic band gap materials, GaN based nanophotonic devices, high speed optoelectronic devices, high performance semiconductor laser diode, GaN MOCVD epitaxial growth, physics and applications of nanostructures, micro electro-mechanical devices, ultrafast phenomena, quantum optics.

Selected Publications

• K.B. Alici, A.E. Serebryannikov, E. Ozbay, “Radiation Properties and Coupling Analysis of a Metamaterial Based, Dual Polarization, Dual Band, Multiple Split Ring Resonator Antenna,” J of Electromagnetic Waves and Applications, vol. 24, pp. 1183-1193 (2010)
• K.B. Alici, F. Bilotti, L. Vegni, E. Ozbay, “Experimantal verification of metamaterial based subwavelength microwave absorbers,” J Applied Physics, vol. 108, pp. 083113-1–6 (2010) (PDF)
• K.B. Alici, E. Ozbay, “Metamaterial inspired enhanced far-field transmission through a subwavelength nano-hole,” Physica Status Solidi Rapid Research Letters, vol. 4, pp. 286-288 (2010)
• K.B. Alici, E. Ozbay, “Theoretical Study and Experimental Realization of a Low-Loss Metamaterial Operating at the Millimeter-Wave Regime: Demonstrations of Flat- and Prism-Shaped Samples,” IEEE J of Selected Topics in Quantum Electronics, vol. 16, pp. 386-393 (2010) (PDF)
• K.B. Alici, A.E. Serebryannikov, E. Ozbay, “Photonic magnetic metamaterial basics,” Photonics and Nanostructures, vol. , pp. (2010)
• E. Arslan, Y. Safak, I. Tascioglu, H. Uslu, E. Ozbay, “Frequency and temperature dependence of the dielectric and AC electrical conductivity in (Ni/Au)/AlGaN/AIN/GaN heterostructures,”Microelectronic Engineering, vol. 87, pp. 1997-2001 (2010)
• E. Arslan, S. Butun, Y. Safak, E. Ozbay, “Investigation of Trap States in AllnN/AIN/GaN Heterostructures by Frequency-Dependent Admittance Analysis,” J of Electronic Materials, vol. 39, pp. 2681-2686 (2010)
• E. Arslan, Y. Safak, S. Altindal, O. Kelekci, E. Ozbay, “Temperature dependent negative capacitance behavior in (Ni/Au)/AlGaN/AıN/GaN heterostructures,” J of Non-crystalline Solids, vol. 356, pp. 1006-1011 (2010)
• D. Ates, A.O. Cakmak, E. Colak, R. Zhao, C.M. Soukoulis, E. Ozbay, “Transmission enhancement through deep subwavelength apertures using connected split ring resonators,” Optics Express, vol. 18, pp. 3952-3966 (2010) (PDF)
• H. Caglayan, S. Cakmakyapan, S.A. Addae, M.A. Pinard, D. Caliskan, K. Aslan, E. Ozbay, “Ultrafast and sensitive bioassay using split ring resonator structures and microwave heating,”Applied Physics Letters, vol. 97, pp. 093701-1–3 (2010) (PDF)

Office: SA-227

Phone: +90 312 290 2512

eMail: oktel[at]fen.bilkent.edu.tr

Associate Professor, Ph.D.: Condensed Matter Physics, MIT, 2001

Web Site

Bose-Einstein condensation, Spinor Quantum Gases, Optical properties of Atomic Gases, One dimensional quantum fluids.

Selected Publications

• F. Yılmaz, F. Nur Ünal, and M. Ö. Oktel, “Evolution of the Hofstadter butterfly in a tunable optical lattice”, Phys. Rev. A 91, 063628 (2015).
• F. Nur Ünal, B. Hetényi, and M. Ö. Oktel, “Impurity coupled to an artificial magnetic field in a Fermi gas in a ring trap”, Phys. Rev. A 91, 053625 (2015).
• N. Ghazanfari, M.O. Oktel, “Rapidly rotating fermions in an anisotropic trap,” European Physical Journal D, vol. 59, pp. 435-441 (2010)
• M.E. Tasgin, M.O. Oktel, L. You, O.E. Mustecaplioglu, “Quantum Entanglement via Superradiance of a Bose Einstein Condensate,” Laser Physics, vol. 20, pp. 700-708 (2010)
• M.E. Tasgin, B. Oztop, M.O. Oktel, O.E. Mustecaplioglu, “Quantum Correlations Among Superradiant Bose-Einstein Condensate Atoms,” Optics & Spectroscopy, vol. 108, pp. 433-437 (2010)
• H. Zhai, R.O. Umucalilar, M.O. Oktel, “Pairing and Vortex Lattices for Interacting Fermions in Optical Lattices with a Large Magnetic Field,” Physical Review Letters, vol. 104, pp. 145301-1–3 (2010)
• B. Oztop, M.O. Oktel, O.E. Mustecaplioglu, L. You, “Quantum entanglement of spin-1 bosons with coupled ground states in optical lattices,” J of Physics B-Atomic Molecular & Optical Physics, vol. 42, pp. 145505-1–9 (2009)
• B. Oztop, M.O. Oktel, O.E. Mustecaplioglu, “Quantum Correlations of Spin-1 Atoms in an Optical Lattice,” Laser Physics, vol. 19, pp. 625-631 (2009)
• M.E. Tasgin, M.O. Oktel, L. You, O.E. Mustecaplioglu, “Quantum correlated light pulses from sequential superradiance of a condensate[reprinted in Vir.J. Quantum Inf. / vol.9],” Physical Review A, vol. 79, pp. 053603-1–10 (2009)
• M.E. Tasgin, O.E. Mustecaplioglu, M.O. Oktel, “Vortex Lattice of a Bose -Einstein Condensate as a Photonic Band Gap Material,” Laser Physics, vol. 19, pp. 647-654 (2009)
• R.O. Umucalilar, M.O. Oktel, “p band in a rotating optical lattice,” Physical Review A, vol. 78, pp. 033602-1–7 (2008)
• R.O. Umucalilar, H. Zhai, M.O. Oktel, “Trapped Fermi Gases in Rotating Optical Lattices: Realization and Detection of the Topological Hofstadter Insulator,” Physical Review Letters, vol. 100, pp. 070402-1–4 (2008)

Office: ARL-102

Phone: +90 312 290 8078

eMail: ckocabas[at]fen.bilkent.edu.tr

Assistant Professor, Ph.D.: Physics, Illinois University, 2007

Web Site

Synthesis of nano-materials and their applications, macroelectronics thin-film technology, nanophotonics, single molecule physics, microfluidics.

Selected Publications

• O. Balci, E. O. Polat, N. Kakenov, C. Kocabaş, “Graphene-enabled electrically switchable radar-absorbing surfaces”, Nature Communications, 6, 662 (2015), (PDF).
• S. Balci, A. Kocabas, C. Kocabas, A. Aydinli, “Localization of Surface Plasmon Polaritons in Hexagonal Arrays of Moire Cavities,” accepted for publication in Applied Physics Letters (PDF).
• S. Balci, A. Kocabas, C. Kocabas, A. Aydinli, “Slowing surface plasmon polaritons on plasmonic coupled cavities by tuning grating grooves,” Applied Physics Letters, vol. 97, pp. 131103-1–3 (2010) (PDF).
• S. Balci, M. Karabiyik, A. Kocabas, C. Kocabas, A. Aydinli, “Coupled Plasmonic Cavities on Moire Surfaces,” Plasmonics, vol. 5, pp. 429-436 (2010).
• E. Pince, C. Kocabas, “Investigation of high frequency performance limit of graphene field effect transistors,” Applied Physics Letters, vol. 97, pp. 173106-1–3 (2010) (PDF).
• J. Xiao, S. Dunham, P. Liu, Y. Zhang, C. Kocabas, L. Moh, Y. Huang, K.-C. Hwang, C. Lu, W. Huang and J.A. Rogers, “Alignment Controlled Growth of Single-Walled Carbon Nanotubes on Quartz Substrates,” Nano Letters 9(12), 4311-4319 (2009). (PDF)
• C. Kocabas, S. Dunham, Q. Cao, K. Cimino, X. Ho, H.-S. Kim, D. Dawson, J. Payne, M. Stuenkel, H. Zhang, T. Banks, M. Feng, S.V. Rotkin and J.A. Rogers, “High-Frequency Performance of Submicrometer Transistors That Use Aligned Arrays of Single-Walled Carbon Nanotubes,” Nano Lett 9(5), 1937-1943 (2009). (PDF)
• A.A. Pesetski, J.E. Baumgardner, S.V. Krishnaswamy, H. Zhang, J.D. Adam, C. Kocabas, T. Banks and J.A. Rogers, “A 500 MHz Carbon Nanotube Transistor Oscillator,” Applied Physics Letters 93, 123506 (2008). (PDF)
• D.-Y. Khang, J. Xiao, C. Kocabas, S. MacLaren, T. Banks, H. Jiang, Y.Y. Huang, and J.A. Rogers, “Molecular Scale Buckling Mechanics in Individual Aligned Single-Wall Carbon Nanotubes on Elastomeric Substrates,” Nano Letters 8(1), 124-130 (2008). (PDF)
• S.J. Kang, C. Kocabas, H.-S. Kim, Q. Cao, M.A. Meitl, D.-Y. Khang and J.A. Rogers, ”Printed Multilayer Superstructures of Aligned Single-Walled Carbon Nanotubes for Electronic Applications,” Nano Letters 7(11), 3343-3348 (2007). (PDF)
• S.J. Kang, C. Kocabas, T. Ozel, M. Shim, N. Pimparkar, M.A. Alam, S.V. Rotkin and J.A. Rogers, “High-performance electronics using dense, perfectly aligned arrays of single-walled carbon nanotubes,” Nature Nanotechnology 2, 230-236 (2007). (PDF)

Office: EE-506

Phone: +90 312 290 8076 

eMail: ilday[at]bilkent.edu.tr

Associate Professor, Ph.D.: Applied Physics, Cornell University, 2003

Personal Website
Research Group Website 

• Nonlinear, far-from-equilibrium, dissipative systems, focussing on:
  (1) Laser-controlled self-organization and self-assembly of nano- and micro-structures
  (2) Dynamics of mode-locked lasers

• Laser physics and engineering:
  (1) Development of ultrafast burst-mode fiber lasers
  (2) Biomedical applications of ultrafast burst-mode lasers

Selected Publications

• B. Öktem, I. Pavlov, S. Ilday, H. Kalaycıoglu, A. Rybak, S. Yavas, M. Erdogan and F. Ö. Ilday, “Nonlinear laser lithography for indefinitely large-area nanostructuring with femtosecond pulses,” Nature Photon. 7, 897–901 (2013).
• H. Kalaycioglu, Y. B. Eldeniz, Ö. Akçaalan, S. Yavas, K. Gürel, M. Efe, and F. Ö. Ilday, “1-mJ Pulse Bursts from a Yb-doped Fiber Amplifier,” Opt. Lett. 37, 2586-2588 (2012).
• S. Yavaş, M. Erdogan, K. Gürel, F. Ö. Ilday, Y. B. Eldeniz, and U. H. Tazebay, “Fiber laser-microscope system for femtosecond photodisruption of biological samples,” Biomed. Opt. Express 3, 605-611 (2012).
• C. Jirauschek, F. Ö. İlday, “Semianalytic theory of self-similar optical propagation and mode-locking using a shape-adaptive model pulse,” Phys. Rev. A 83, 063809 (2011).
• B. Oktem, C. Ülgüdür and F. Ö. Ilday, “Soliton-similariton fibre laser,” Nature Phot., 4, 307 (2010).
• F. Ö. Ilday, J. Buckley, and F. W. Wise, “Self-similar evolution of parabolic pulses in a laser cavity,” Phys. Rev. Lett. 92, 213902-1 (2004).

Click here for the most up-to-date list.

Office: SA-224

Phone: +90 312 290 1972

eMail: hetenyi[at]fen.bilkent.edu.tr

Assistant Professor

Web Site

Condensed Matter Physics, Statistical Physics, Metal-Insulator Transitions

Selected Publications

• B. Hetényi “Drude weight, Meissner weight, rotational inertia of bosonic superfluids: how are they distinguished?”, J. Phys. Soc. Jpn. 83 034711 (2014).
• B. Hetényi, “dc conductivity as a geometric phase”, Phys. Rev. B 87 235123 (2013).
• B. Hetényi, “Current Response in Extended Systems as a Geometric Phase: Application to Variational Wavefunctions” J. Phys. Soc. Japan, vol. 81, 124711 (2012).
• A.F. Albuquerque, D. Schwandt, B. Hetényi, S. Capponi, M. Mambrini, A.M. Läuchli, “Phase Diagram of a Frustrated Quantum Antiferromagnet on the Honeycomb Lattice: Magnetic Order versus Valence-Bond Crystal formation” Phys. Rev. B 84, 024406 (2011).
• B. Hetényi, “Approximate solution of variational wave functions for strongly correlated systems: Description of bound excitons in metals and insulators”, Phys. Rev. B 82, 115104 (2010).

Office: SA-225

Phone: +90 312 290 1937

eMail: gulseren[at]fen.bilkent.edu.tr

Professor, Ph.D.: Condensed Matter Physics, Bilkent University, 1992

Web Site

Theoretical Condensed Matter Physics, Nanoscience, Graphene, Solar cells, Plasmonics, Metal nanowires, carbon nanotubes, electronic structure of solids, material properties from first principles.

Selected Publications

• Hatice Ünal, Oğuz Gülseren, Şinasi Ellialtıoğlu, and Ersen Mete, Electronic structures and optical spectra of thin anatase TiO2 nanowires through hybrid density functional and quasiparticle calculations, Physical Review B 89, 205127 (2014)
• Jiwuer Jilili, Ayjamal Abdurahman, Oğuz Gülseren and Udo Schwingenschlögl, Non-covalent functionalization of single wall carbon nanotubes and graphene by a conjugated polymer, Applied Physics Letters 105, 013103 (2014).
• M. Can Günendi, İrem Tanyeli, Gürsoy B. Akgüç, Alpan Bek, Raşit Turan, and O. Gülseren, Understanding the plasmonic properties of dewetting formed Ag nanoparticles for large area solar cell applications, Optics Express 21, 18344-18353 (2013).
• Ruslan Hummatov, Daniele Toffoli, O. Gülseren, Emrah Özensoy, Hande Üstünel, First-principles investigation of NOx and SOx adsorption on anatase-supported BaO and Pt overlayers, Journal Physical Chemistry C 116, 6191-6199 (2012).
• Selcen İslamoğlu, M. Ö. Oktel and O. Gülseren; Hofstadter butterfly of graphene with point defects, Physical Review B 85, 235414 (2012).
• Deniz Çakır, O. Gülseren, Adsorption of Pt and bimetallic Pt-Au clusters on the partially reduced rutile (110) TiO2 surface: A first-principles study, Journal Physical Chemistry C 116, 5735-5746 (2012).
• Gursoy B. Akguc, O. Gülseren, Thermoelectric Efficiency of nanowires with long range surface disorder, Physical Review B 85, 075432 (2012).
• M. F. Genişel, Md. N. Uddin, Z. Say, M. Kulakci, R. Turan, O. Gülseren, E. Bengu, Bias in bonding behavior among boron, carbon, and nitrogen atoms in ion implanted BNx, BCx, and diamond like carbon films, Journal of Applied Physics 110, 074906 (2011).
• D. Çakır, O. Gülseren; Effect of impurities on the mechanical and electronic properties of Au, Ag, and Cu monatomic chain nanowires, Physical Review B 84, 085450 (2011).
• D. Çakır, O. Gülseren, E. Mete, Ş. Ellialtıoğlu; Interaction of BrPDI, BrGly, and BrAsp with the Rutile TiO(2)(110) Surface for Photovoltaic and Photocatalytic Applications: A First-Principles Study, Journal Of Physical Chemistry C 115, 9220-9226 (2011).
• G. Kucukayan, R. Ovali, S. Ilday, B. Baykal, H. Yurdakul, S. Turan, O. Gülseren, E. Bengu; An experimental and theoretical examination of the effect of sulfur on pyrolytically grown carbon nanotubes from sucrose-based solid state precursors, Carbon 49, 508-517 (2011).

Office: SA-223

Phone: +90 312 290 2107

eMail: agokalp[at]fen.bilkent.edu.tr

Professor, Ph.D.: Physics, Stanford University, 1980

Radiative vector meson decays. QCD sum rules in phenomenological high energy physics. Nuclear transport theory and nuclear many-body dynamics with applications to  giant resonances, nuclear collisions, and nuclear fusion.

Selected Publications

• O. Yilmaz, S. Ayık, F. Acar, S. Saatci and A. Gokalp, “Investigations of spinodal dynamics in asymmetric nuclear matter within a stochastic relativistic model”, European Physical Journal A 49 (2013) 33.
• S. Ayık, O. Yilmaz, F. Acar, B. Danisman, N. Er and A. Gokalp, ” Investigations of instabilities in nuclear matter in stochastic relativistic models “, Nuclear Physics A 859 (2011) 73.
• O. Yilmaz, S. Ayık and A. Gokalp, “Quantal description of instabilities in nuclear matter in a stochastic relativistic model “, European Physical Journal A 47 (2011) 123.
• A. Gokalp, F. Ozturk and O. Yilmaz, “Scalar f₀ and a₀ mesons in radiative φ→K⁺K^–γ decay”, Physics Letters B 671 (2009) 369.
• S. Ayık, O. Yilmaz, N. Er, A. Gokalp and P. Ring, ” Spinodal instabilities in nuclear matter in a stochastic relativistic mean-field approach “, Physical Review C 80 (2009) 034613.
• A. Gokalp, Y. Sarac, and O. Yilmaz, “ΚK⁰γ-vertex in light cone QCD sum rules “, Physical Review D 77 (2008) 114015.
• S. Ayik, N. Er , O. Yilmaz, A. Gokalp ,“Quantal effects on spinodal instabilities in charge asymmetric nuclear matter”, Nuclear Physics A 812 (2008) 44.
• A. Gokalp, C. S. Korkmaz and O. Yilmaz, ” Scalar mesons in radiative φ→KKγ decay”, Physical Review D 75 (2007) 013001.
• A. Gokalp, Y. Sarac, O. Yılmaz, ” An analysis of f0- mixing in light cone QCD sum rules”, Physics Letters B 609 (2005) 291.
• S. Ayik, B. Yilmaz, A. Gokalp, O. Yilmaz, and N. Takigawa, ” Quantum statistical effects on fusion dynamics”, Physical Review C 71 (2005) 054611.

Office: SA-222

Phone: +90 312 290 1388

eMail: ahmet.eris[at]fen.bilkent.edu.tr

Professor, Ph.D., Physics, Middle East Technical University 1976

Classified Field Theories, Theory of Gravitation, Harmonic Maps, Completely Integrable Systems.

Office: SA-215

Phone: +90 312 290 1475

eMail: ercelebi[at]fen.bilkent.edu.tr

Professor, Chairman, Ph.D.: Condensed Matter Physics, Middle East Technical University, 1980

Web Site

Polarons, electron-phonon interactions, excitons, low dimensional quantum well-heterostructure-type semiconducting systems.

Selected Publications

• R.T. Senger, B. Kozal, A. Chatterjee, A. Ercelebi, “Hartree-Fock approximation of bipolaron state in quantum dots and wires,” accepted for publication in European Physical Journal B, vol. 78, pp.525-529 (2010) [PDF]
• R.T. Senger, A. Ercelebi, “Strong-Coupling Treatment of Two Dimensional Large Bipolarons in Elliptical Quantum Dots,” European Physical Journal B, vol. 26, pp. 253-260 (2002)[PDF]
• R.T. Senger, A. Ercelebi, “On the stability of Fröhlich Bipolarons in Spherical Quantum Dots,” J of Physics Condensed Matter, vol. 14, pp. 5549-5560 (2002)[PDF]
• R.T. Senger, A. Ercelebi, “Path-integral approximation on the stability of large bipolarons in Q1D-confinement,” Physical Review B, vol. 61, pp. 6063-6068 (2000)[PDF]
• R.T. Senger, A. Ercelebi, “Stability of low-dimensionally confined bipolarons,” European Physical Journal B, vol. 16, pp. 439-446 (2000)[PDF]
• R.T. Senger, A. Ercelebi, “Quasi-two-dimensional Feynman bipolarons,” Physical Review B, vol. 60, pp. 10070-10079 (1999)[PDF]
• R.T. Senger, A. Ercelebi, “Path integral description of low dimensional polarons in parabolic confinement potentials,” J of Physics Condensed Matter, vol. 9, pp. 5067-5079 (1997)[PDF]
• A. Ercelebi, R.T. Senger, “Ground state description of quasi-1D polarons with arbitrary electron-phonon coupling strength,” Physical Review B, vol. 53, pp. 11008-11015 (1996)[PDF]
• A. Ercelebi, R.T. Senger, “Strong Coupling Characterisation of Quasi-1D polarons in cylindrical QW-wires,” Solid State Communications, vol. 97, pp. 509-514 (1996)[PDF]
• A. Ercelebi, R.T. Senger, “A Variational Study of the Ground Landau level of the 2D-Frohlich polaron in a magnetic field,” J of Physics Condensed Matter, vol. 7, pp. 9989-10002 (1995)[PDF]

Office: EE507

Phone: +90 312 290 1021

eMail: volkan[at]fen.bilkent.edu.tr

Professor, Ph.D.: Electrical Engineering, Stanford University, 2004

Web Site

Group Web Site

Light-emitting diodes (LEDs),semiconductor nanocrystal optoelectronics, energy transfer driven devices and sensors, nanoparticles/nanocomposites, nanophotonics, RF sensing bioimplants and medical devices.

Selected Publications

• B. Guzelturk, Y. Kelestemur, K. Gungor, A. Yeltik, M. Z. Akgul, Y. Wang, R. Chen, C. Dang, H. Sun and H. V. Demir, “Stable and Low Threshold Optical Gain in CdSe/CdS Quantum Dots: All-Colloidal Frequency Up-Converted Laser” Advanced Materials 27, 2678 (2015).
• M. Olutas, B. Guzelturk, Y. Kelestemur, A. Yeltik, S. Delikanli and H. V. Demir, “Lateral Size-Dependent Spontaneous and Stimulated Emission Properties in Colloidal CdSe Nanoplatelets” ACS Nano 9, 5041 (2015).
• S. Delikanli, B. Guzelturk, P. L. Hernández-Martínez, T. Erdem, Y. Kelestemur, M. Olutas, M. Z. Akgul and H. V. Demir, “Continuously Tunable Emission in Inverted Type-I CdS/CdSe Core/Crown Semiconductor Nanoplatelets” Advanced Functional Materials 25, 4282 (2015).
• B. Guzelturk, Y. Kelestemur, M. Olutas, S. Delikanli and H. V. Demir, “Amplified Spontaneous Emission and Lasing in Colloidal Nanoplatelets” ACS Nano 8, 6599 (2014).
• B. Guzelturk, O. Erdem, M. Olutas, Y. Kelestemur and H. V. Demir, “Stacking in colloidal nanoplatelets: excitonic properties” ACS Nano 8, 12524 (2014). 
• Y. Ji, W. Liu, T. Erdem, R. Chen, S. T. Tan, Z.-H. Zhang, Z. Ju, X. Zhang, H. Sun, X. W. Sun, Y. Zhao, S. P. DenBaars, S. Nakamura and H. V. Demir, “Comparative study of field-dependent carrier dynamics and emission kinetics of InGaN/GaN light-emitting diodes grown on (11-22) semipolar versus (0001) polar planes” Applied Physics Letters104, 143506 (2014).
• A. O. Govorov, H. Zhang, H. V. Demir, Y. K. Gunko, “Photogeneration of hot plasmonic electrons with metal nanocrystals: Quantum description and potential applications” Nano Today 9, 85 (2014). Invited Paper.
• T. Özel, P. L. Hernandez-Martinez, E. Mutlugün, O. Akın, S. Nizamoğlu, İ. Ö. Özel, Q. Zhang, Q. Xiong and H. V. Demir, “Observation of Selective Plasmon-Exciton Coupling in Nonradiative Energy Transfer: Donor-Selective vs. Acceptor-Selective Plexcitons”Nano Letters 13, 3065 (2013).
• E. Mutlugün, P. L. Hernandez-Martinez, C. Eroğlu, Y. Coşkun, T. Erdem, V. K. Sharma, E. Ünal, S. K. Panda, S. G. Hickey, N. Gaponik, A. Eychmuller and H. V. Demir, “Large-area (over 50 cm x 50 cm) freestanding films of colloidal InP/ZnS quantum dots” Nano Letters 12, 3986 (2012). 
• H. V. Demir, S. Nizamo lu, T. Erdem, E. Mutlugun, N. Gaponik, A. Eychmuller “Quantum dot integrated LEDs using photonic and excitonic color conversion,” Nano Today, 6, 632 (2011). Invited Paper.

Office: SA229

Phone: +90 312 290 1216

eMail: ciraci[at]fen.bilkent.edu.tr

Professor, Ph.D.: Condensed Matter Physics, Stanford University, 1974

Web Site

Nanomaterials, nanodevices, Hydrogen storage, Surface physics, electronic structures of solids, electron systems of lower dimensionality, mesoscopic physics, scanning tunneling and atomic force microscopy, chemisorption theory, metalization, strained semiconductor superlattices.

Selected Publications

• Stable, single-layer MX2 transition-metal oxides and dichalcogenides in a honeycomb-like structure, C. Ataca, H. Sahin and S. Ciraci, Journal of Physical Chemistry C, 116, 8982 , (2012).
• Frictional figure of merits for layered nanostructures: S. Cahangirov, C. Ataca. M. Topsakal, H. Sahin and S. Ciraci, Physical Review Letters, 108, 126103 (2012).
• Effects of static charging and exfoliation of layered crystals: M. Topsakal, S. Ciraci, Physical Review B 85, 4, 045121 ( 2012)
• Perpendicular growth of carbon chains on graphene from first-principles: C. Ataca, S. Ciraci, Physical Review B 83, 23, 235417 (Jun. 14, 2011)
• Two and One Dimensional Honeycomb Structures of Silicon and Germanium: S. Cahangirov, M. Topsakal, E. Akturk, S.Ciraci, Physical Review Letters 102, 236804 (Jun. 2009)
• Half-metallic silicon nanowires: First-principles calculations, E. Durgun, D. Cakır, N. Akman, S. Ciraci, Physical Review Letters 99 (25): Art. No. 256806 (2007).
• Transition-metal-ethylene complexes as high-capacity hydrogen-storage media; E.Durgun, S.Ciraci, W.Zhou, T. Yildirim, Physical Review Letters 97 (22): Art.No.226102 (2006) (COVER STORY).
• Titanium-decorated carbon nanotubes as a potential high-capacity hydrogen storage medium; T.Yildirim, S.Ciraci, Physical Review Letters 94 (17): Art.No.175501 (2005).
• Chiral single-wall gold nanotubes; RT. Senger, S.Dag, S.Ciraci, Physical Review Letters 93 (19) Art.No.196807 (2004).
• Ab-initio electron transport calculations of carbon based string structures; S.Tongay, RT.Senger, S.Dag, S. Ciraci., Physical Review Letters 93(13): Art.No.136404 (2004).