Now showing items 205-224 of 233

    • Structural and electronic properties of carbon-based materials 

      Kılıç, Çetin (Bilkent University, 2000)
      In this thesis, some carbon-based materials in nano scale have been investigated by using first-principles methods as well as transferable tight-binding and empirical potential models. The focus of interest has been in ...
    • A study of adsorption of single atoms on carbon nanotubes 

      Durgun, Engin (Bilkent University, 2003)
      The adsorption of individual atoms on the semiconducting and metallic singlewall carbon nanotubes (SWNT) have been investigated by using first-principles pseudopotential plane wave method within Density Functional Theory. ...
    • Study of anisotropic particles in active bath 

      Mehmood, Naveed (Bilkent University, 2015)
      Brownian (passive) particles undergo random motion due to thermal agitation in the surrounding medium. In recent years, a lot of attention has been devoted to study active Brownian particles, i.e., microscopic particles ...
    • Sub-wavelength resolution in a photonic crystal superlens 

      Çubukçu, Ertuğrul (Bilkent University, 2003)
      Materials that can bend light in the opposite direction to normal (’left-handed’ materials) reverse the way in which refraction usually works-this negative refractive index is due to simultaneously negative permeability ...
    • Subwavelength surface plasmon interferometer for high-throughput sensing 

      Yavaş, Özlem (Bilkent University, 2012)
      Small detection volume, increased analysis speed and reduced cost are the main driving forces for miniaturized lab-on-a-chip systems. Subwavelength holes on opaque metal films provide a unique configuration for miniaturized ...
    • Superconducting systems of low dimensionality 

      Gedik, M. Zafer (Bilkent University, 1992)
      It is possible to call the last five years as the golden age of superconductivity. The two most important developments in the field are the discovery of copper oxide and fullerene superconductors. In this work, some ...
    • Superconductivity in ultrasmall metallic grains 

      Bozat, Özgür (Bilkent University, 2001)
    • Supercurrents and persistent currents in strongly correlated electron systems 

      Boyacı, Hüseyin (Bilkent University, 1995)
      The lull understanding· ol’the solution Гог the 1-tl Hubbard model is of interest in its own right, and may provide clues to the understanding of higher dimensioned systiMiis. We have found tin? exact solution of tlie ...
    • Surface plasmon based enhanced transmission of electromagnetic waves 

      Bıyıklı, Süheyla Sena Akarca (Bilkent University, 2004)
      Grating-coupling phenomena between surface plasmons and electromagnetic waves are studied in the microwave spectrum using metallic gratings. Transmission and reflection measurements were carried out to observe the transmitted ...
    • Temperature dependent density profiles and collective oscillations of dipolar droplets 

      Aybar, Enes (Bilkent University, 2019-09)
      Dipolar droplets are a novel form of Bose gas that form in a regime where the mean field theory predicts collapse. In the literature, the beyond mean field e ects in the form of the Lee-Huang-Yang correction to the local ...
    • A theoretical model for the epitaxial growth of Si(100) surface 

      Dağ, Sefa (Bilkent University, 2000)
      In this thesis, we investigated atomic scale mechanisms of growth on the Si(lOO) surface. First principles quantum molecular dynamics calculations are performed, where self-consistent field electronic structure calculations ...
    • A theoretical study of strained monolayer transition metal dichalcogenides based on simple band structures 

      Aas, Shahnaz (Bilkent University, 2019-11)
      This doctoral thesis deals with optoelectronic and geometric band properties of two-dimensional transition metal dichalcogenides (TMDs) under applied strain. First, we analyze various types of strain for the K valley ...
    • Theory of atomic scale friction 

      Buldum, Alper (Bilkent University, 1998)
      Friction is an old and important but at the same time very complex physical event. This thesis aims to develop an atomic scale theory of friction. VVe investigate various atomic processes and stick-slip motion by using ...
    • Thermoelectric efficiency in model nanowires 

      Badalov, Sabuhi (Bilkent University, 2013)
      Nowadays, the use of thermoelectric semiconductor devices are limited by their low efficiencies. Therefore, there is a huge amount of research effort to get high thermoelectric efficient materials with a fair production ...
    • Tight binding modeling of two dimensional and quasi-two dimensional materials 

      Singh, Deepak Kumar (Bilkent University, 2017-10)
      Since the advent of graphene, two-dimensional (2D) materials have consistently been studied owing to their exceptional electronic and optical properties. While graphene is completely two-dimensional in nature, its other ...
    • Time dependent study of quantum bistabiliity 

      Ecemiş, Mustafa Ihsan (Bilkent University, 1995)
      The analysis of quantum transport phenomena in small systems is a prominent topic of condensed matter physics due to its numerous technological applications. The current analytical theories are not adequate for ...
    • A time-dependent study of bistability in resonant tunneling structures 

      Keçecioğlu, Ersin (Bilkent University, 1997)
      A comjDutational time-dependent study of the bistability in resonant tunneling structures including the electron-electron interactions is presented. A new computational method for the investigation of many jDarticle ...
    • Titanium dioxide nanostructures for photocatalytic and photovoltaic applications 

      Çakır, Deniz (Bilkent University, 2008)
      In this thesis, TiO2 nanostructures and their photocatalytic and photovoltaic ap- plications have been investigated by using the ¯rst-principles calculations based on density functional theory. We have concentrated on ...
    • Topological aspects of charge transport in quantum many-body systems 

      Yahyavi, Mohammad (Bilkent University, 2019-02)
      Motivated by the recent proposals and developments of topological insulators and topological superconductors for their potential applications in electronic devices and quantum computing, we have theoretically studied ...
    • Tuning the exciton-plasmon coupling 

      Ateş, Simge (Bilkent University, 2012)
      Exciton-plasmon coupling has recently drawn much interest. In this work, FDTD simulations of exciton-plasmon coupling in plasmonic cavity structures with corrugation patterns are investigated. Excitonic modes are obtained ...