Now showing items 75-94 of 225

    • Germanium alloys for optoelectronic devices 

      Erbil, Ayşe (Bilkent University, 2008)
      Silicon has been the backbone of the mainstream electronics of the last fifty years. It is however, used in conjunction with other matierals, mainly with its oxides and nitrides. Germanium, on the other hand, is also a ...
    • Graphene based high frequency electronics 

      Pinçe, Erçağ (Bilkent University, 2010)
      Recent advances in chemical vapor deposition of graphene on large area substrates stimulate a significant research effort in order to search for new applications of graphene in the field of unusual electronics such as ...
    • Graphene based optoelectronics in the visible spectrum 

      Polat, Emre Ozan (Bilkent University, 2015)
      Graphene, a two dimensional crystal of carbon atoms, emerges as a viable material for optoelectronics because of its electrically-tunable broadband optical properties. Optical response of graphene at visible and near ...
    • Graphene-based electrically tunable terahertz optoelectronics 

      Kakenov, Nurbek (Bilkent University, 2016-11)
      Advances in terahertz (THz) research and technology, has bridged the gap between radio-frequency electronics and optics. More efficient control of THz waves would highly benefit noninvasive, high-resolution imaging ...
    • Grating based plasmonic cavities 

      Şenlik, Servet Seçkin (Bilkent University, 2009)
      Surface plasmon polaritons are dipole carrying electromagnetic excitations occur- ing at metal-dielectric interfaces. Metallic periodic structures exhibit modi¯ed transmission and re°ection spectra owing to the interaction ...
    • Grating loaded integrated optical cantilevers 

      Karademir, Ertuğrul (Bilkent University, 2010)
      Cantilever beams are the most important parts of standard scanning probe microscopy. In this work, an integrated optical approach to sense the deflection of a cantilever beam is suggested and realized. A grating coupler ...
    • Gravitational waves from binary black hole systems in inspiralling phase 

      Kökcü, Efekan (Bilkent University, 2018-07)
      Binary black hole systems have three phases: inspiralling, merger and ringdown phases. This thesis is a review of methods developed to study the inspiralling phase analytically. Those methods include post Minkowskian ...
    • Ground state energy of the fröhlich polaron as a function of dimensionality and the phonon coupling strength 

      Bayrak, Hamdi Burak (Bilkent University, 2018-09)
      We use the trial polaron wave function introduced by Devreese et al. [1] to estimate the ground state energies of the Fröhlich polaron over a broad range of the phonon coupling strength by a variational approach. We ...
    • Ground-state properties of double-wire semiconducting systems 

      Müstecaplıoğlu, Nihal Mutluay (Bilkent University, 1997)
      With the recent advances in nanometer-scale semiconductor device fabrication technology, it became experimentally possible to produce strongly confined electron systems. Quantum wires are among these systems, and are ...
    • Ground-state properties of ultra-cold atomic gases 

      Sevinçli, Sevilay (Bilkent University, 2008)
      After the observation of Bose-Einstein condensation, the developments in the experimental control and measurement methods provided the realization of basic models of many-body physics using dilute, ultra-cold gases. This ...
    • The growth, fabrication and characterization of high performance AI(formula)Ga(formula)N metal-semiconductor-metal photodiodes 

      Bütün, Serkan (Bilkent University, 2006)
      High performance UV photodetectors have attracted unwarranted attention for various applications, such as in military, telecommunication, and biological imaging, as an AlxGa1-xN material system is also rather suitable ...
    • Haldane phase in the bond-alternating spin-1/2 XXZ chain: DMRG and fermionization studies 

      Bahovadinov, Murod (Bilkent University, 2019-01)
      In this thesis, the subject of study is the Haldane phase in bond - alternating XXZ chain with S =1/2. We firstly mapped our model to the fermionic chain by the use of standard Jordan-Wigner Transformation, which leads ...
    • Hard spin mean field theory of 3D stacked-triangular-lattice system 

      Akgüç, Gürsoy Bozkurt (Bilkent University, 1994)
      Closed form solution of ‘Hard spin mean field theory’ is constructed and applied to ‘Three dimensional stacked-triangular-system’. The phase diagram of this system is examined. ‘Free energy’ is calculated to reveal ...
    • High field transport phenomena in wide bandgap semiconductors 

      Sevik, Cem (Bilkent University, 2003)
      The Ensemble Monte Carlo (EMC) method is widely used in the field of computational electronics related to the simulation of the state of the art devices. Using this technique our specific intention is to scrutinize the ...
    • High speed and high efficiency infrared photodetectors 

      Kimukin, İbrahim (Bilkent University, 2004)
      The increasing demand for telecommunication systems resulted in production of high performance components. Photodetectors are essential components of optoelectronic integrated circuits and fiber optic communication ...
    • High Tc superconductivity 

      Gedik, M. Zafer (Bilkent University, 1989)
      critical summary of the recent developments in high temperature superconductivity is given. Physical properties of the new materials are summarized. The new theories proposed to explain high Tc are reviewed. In the case ...
    • Hot electron interactions in nanostructures 

      Kaya, Ismet Inonu (Bilkent University, 1997)
      Modern semiconductor growth and processing techiques have provided the capability of fabricating a huge variety of devices which have atomically precise layered structures and lateral patterns with nanometer sizes. This ...
    • Hubbard model In Square Lattices: A Mean-field Hartree-fock Approach 

      Yönaç, Muhammed (Bilkent University, 2005)
      This thesis is mainly an effort to reproduce the well-known results that HartreeFock approximation gives for the Hubbard Model in two dimensions. As the area of application magnetic phases in the finite-size square ...
    • Hyperfine and electric quadrupolar interaction-driven loschmidt echo in nanoscale nuclear spin baths 

      Güldeste, Ekrem Taha (Bilkent University, 2018-07)
      Environmental dynamics in solid state matrix is of much importance for quantum information processing and storage purposes. Here, we first give a basic recipe to get Loschmidt echo (LE) which is a measure of decoherence ...