Recent Submissions

  • Many-body effects in a two-component, one-dimensional electron gas with repulsive, short-range interactions 

    Tanatar, B. (Elsevier, 1998-03-09)
    We investigate the correlation effects in a two-component, one-dimensional electron gas interacting via repulsive δ function interactions. Electron correlations are treated within the approximation scheme of Singwi, Tosi, ...
  • The behavior of the I-V-T characteristics of inhomogeneous (Ni/Au)-Al0.3Ga0.7N/AlN/GaN heterostructures at high temperatures 

    Tekeli, Z.; Altindal, S.; Cakmak, M.; Ozcelik, S.; Caliskan, D.; Ozbay, E. (American Institute of Physics., 2007-09-12)
    We investigated the behavior of the forward bias current-voltage-temperature (I-V-T) characteristics of inhomogeneous (Ni/Au)-Al0.3Ga0.7N/AlN/GaN heterostructures in the temperature range of 295-415 K. The experimental ...
  • Graphene coatings: An efficient protection from oxidation 

    Topsakal, M.; Sahin, H.; Ciraci, S. (American Physical Society, 2012-04-23)
    We demonstrate that graphene coating can provide efficient protection from oxidation by posing a high-energy barrier to the path of oxygen atom, which could have penetrated from the top of the graphene to the reactive ...
  • Skin-like self-assembled monolayers on InAs/GaSb superlattice photodetectors 

    Salihoglu, O.; Muti, A.; Kutluer, K.; Tansel, T.; Turan, R.; Aydinli, A. (IOP Publishing, 2012)
    We report on the effects of monolayer (ML) thick skin-like octadecanethiol (ODT, CH3[CH2](17)SH) on type-II InAs/GaSb MWIR photodetectors. Circumventing the ageing effects of conventional sulfur compounds, we use ODT, a ...
  • "N" structure for type-II superlattice photodetectors 

    Salihoglu, O.; Muti, A.; Kutluer, K.; Tansel, T.; Turan, R.; Ergun, Y.; Aydinli, A. (American Institute of Physics., 2012-08-14)
    In the quest to raise the operating temperature and improve the detectivity of type II superlattice (T2SL) photodetectors, we introduce a design approach that we call the "N structure." N structure aims to improve absorption ...
  • Hedonic coalition formation games: A new stability notion 

    Karakaya, M. (Elsevier, 2011-05)
    This paper studies hedonic coalition formation games where each player's preferences rely only upon the members of her coalition. A new stability notion under free exit-free entry membership rights, referred to as strong ...
  • Adsorption of carbon adatoms to graphene and its nanoribbons 

    Ataca, C.; Akturk, E.; Sahin, H.; Ciraci, S. (AIP Publishing, 2011)
    This paper investigates the adsorption of carbon adatoms on graphene and its nanoribbons using first-principles plane wave calculations within density functional theory. The stability at high carbon adatom coverage, ...
  • First principles study of structural phase stability of wide-gap semiconductors MgTe, MgS and MgSe 

    Gokoglu, C.; Durandurdu, M.; Gulseren, O. (Elsevier, 2009-12)
    The structural stability of different crystallographic phases of three magnesium chalcogenides, MgTe, MgS and MgSe, are investigated from first principles calculations based on density functional theory (DFT) using projector ...
  • High Selectivity Boolean Olfaction Using Hollow-Core Wavelength-Scalable Bragg Fibers 

    Yaman, M.; Yildirim, A.; Kanik, M.; Cinkara, T. C.; Bayindir, M. (American Chemical Society, 2012-01-01)
    A new odorant detection scheme, based on infrared absorption of volatile organics inside an optofluidic channel array, is discussed in terms of its selectivity. The sensor unit of the array is a hollow core Bragg fiber ...
  • Hall conductance in graphene with point defects 

    Islamoglu, S.; Oktel, M. O.; Gulseren, O. (IOP Publishing, 2013-01-08)
    We investigate the Hall conductance of graphene with point defects within the Kubo formalism, which allows us to calculate the Hall conductance without constraining the Fermi energy to lie in a gap. For pure graphene, which ...
  • Graphene based flexible electrochromic devices 

    Polat, E. O.; Balci, O.; Kocabas, C. (2045-2322, 2014-10-01)
    Graphene emerges as a viable material for optoelectronics because of its broad optical response and gate-tunable properties. For practical applications, however, single layer graphene has performance limits due to its small ...
  • Grating based plasmonic band gap cavities 

    Senlik, S. S.; Kocabas, A.; Aydinli, A. (Optical Society of America, 2009)
    We report on a comparative study of grating based plasmonic band gap cavities. Numerically, we calculate the quality factors of the cavities based on three types of grating surfaces; uniform, biharmonic and Moiré surfaces. ...
  • Vortex lattices in dipolar two-compenent Bose-Einstein condensates 

    Ghazanfari, N.; Keles, A.; Oktel, M. O. (American Physical Society, 2014-02-21)
    We consider a rapidly rotating two-component Bose-Einstein condensate with short-range s-wave interactions as well as dipolar coupling. We calculate the phase diagram of vortex lattice structures as a function of the ...
  • Effects of silicon and germanium adsorbed on graphene 

    Akturk, E.; Ataca, C.; Ciraci, S. (American Institute of Physics, 2010-03-25)
    Based on the first-principles plane wave calculations, we studied the adsorption of Si and Ge on graphene. We found that these atoms are bound to graphene at the bridge site with a significant binding energy, while many ...
  • Direct imaging of localized surface plasmon polaritons 

    Balci, S.; Karademir, E.; Kocabas, C.; Aydinli, A. (Optical Society of America, 2011-08-26)
    In this Letter, we report on dark field imaging of localized surface plasmon polaritons (SPPs) in plasmonic waveguiding bands formed by plasmonic coupled cavities. We image the light scattered from SPPs in the plasmonic ...
  • Structures of fluorinated graphene and their signatures 

    Sahin, H.; Topsakal, M.; Ciraci, S. (American Physical Society, 2011)
    Recent synthesis of fluorinated graphene introduced interesting stable derivatives of graphene. In particular, fluorographene (CF), namely, fully fluorinated chair conformation, is found to display crucial features, such ...
  • Plasmon-polaritons on graphene-metal surface and their use in biosensors 

    Salihoglu, O.; Balci, S.; Kocabas, C. (AIP Publishing, 2012)
    We studied excitation of surface plasmon-polaritons on graphene-metal surface. The metal surface is functionalized by transfer printing of graphene grown by chemical vapor deposition on copper foils. Surface plasmon resonance ...
  • Probing molecular interactions on carbon nanotube surfaces using surface plasmon resonance sensors 

    Kakenov, N.; Balci, O.; Balci, S.; Kocabas, C. (American Institute of Physics, 2012)
    In this work, we present a method to probe molecular interactions on single-walled carbon nanotube (SWNT) surfaces using a surface plasmon sensor. SWNT networks were synthesized by chemical vapor deposition and transfer-printed ...
  • Tuning surface plasmon-exciton coupling via thickness dependent plasmon damping 

    Balci, S.; Kocabas, C.; Ates, S.; Karademir, E.; Salihoglu, O.; Aydinli, A. (American Physical Society, 2012)
    In this paper, we report experimental and theoretical investigations on tuning of the surface plasmon-exciton coupling by controlling the plasmonic mode damping, which is defined by the plasmonic layer thickness. The results ...
  • Rapid thermal annealing of graphene-metal contact 

    Balci, O.; Kocabas, C. (American Institute of Physics, 2012)
    High quality graphene-metal contacts are desirable for high-performance graphene based electronics. Process related factors result large variation in the contact resistance. A post-processing method is needed to improve ...

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