Now showing items 40-59 of 225

    • Electro-magnetic properties and phononic energy dissipation in graphene based structures 

      Sevinçli, Haldun (Bilkent University, 2008)
      With the synthesis of a single atomic plane of graphite, namely graphene honeycomb structure, active research has been focused on the massless Dirac fermion behavior and related artifacts of the electronic bands crossing ...
    • Electronic and atomic processes in nanowires 

      Mehrez, Hatem (Bilkent University, 1996)
      The variation of conductance of a nanowire which is pulled between two metal electrodes has been the subject of dispute. Recent experimental set-ups using a combination of STM and AFM show that changes in conductivity ...
    • Electronic structure of graphene nano-ribbons 

      Şen, Hüseyin Şener (Bilkent University, 2008)
      Graphite is a known material to human kind for centuries as the lead of a pencil. Graphene as a two dimensional material, is the single layer of graphite. Many theoretical works have been done about it so far, however, ...
    • Electronic structure of graphene under the influence of external fields 

      İslamoğlu, Selcen (Bilkent University, 2012)
      In this thesis, the electronic structure of graphene under the influence of external fields such as strain or magnetic fields is investigated by using tight-binding method. Firstly, we study graphene for a band gap opening ...
    • Electronic structure of low dimensional semiconductor systems 

      Gulseren, Oguz (Bilkent University, 1992)
      Recent progress made in the growth techniques has led to the fabrication of the artificial semiconductor systems of lower dimension. Electrons and holes in these materials have quantization different from those of the ...
    • Electronic structure of Si/Ge semiconductor superlattices 

      Gülseren, Oğuz (Bilkent University, 1988)
      A brief review about the two dimensional electron systems and especially band offsets is given. The electronic properties of the Si„/Ge„(001) strained superlattices as a function of the superlattice periodicity and the ...
    • Electrostatic correlations in inhomogeneous electrolytes 

      Ebrahimzadeh, Pezhman (Bilkent University, 2018-08)
      The field-theoretic approach is used to obtain the self-consistent equations for inhomogeneuos symmetric electrolytes. The perturbative Green's function method is used to solve these self-consistent equations for an ...
    • Energy and angular momentum transfer with circular Rydberg states 

      Aliyu, Mohammad Mujaheed (Bilkent University, 2017-08)
      Circular states belong to a class of Rydberg states having maximum angular momentum. These states, compared to other Rydberg states, have longer lifetimes, and in the classical limit resemble circular Bohr-like orbits. ...
    • Enhanced confined microwave transmission by single subwavelength apertures 

      Çağlayan, Hümeyra (Bilkent University, 2005)
      Grating-coupling phenomena between surface plasmons and electromagnetic waves are studied in the microwave spectrum using metallic circular apertures surrounded by an array of grooves. The measurements are performed in ...
    • Entanglement : quantification via uncertainties and search among ultracold bosons in optical lattices 

      Öztop, Barış (Bilkent University, 2009)
      In the first part of the Thesis, the known measures of entanglement for finite dimensional systems are reviewed. Both the simplest case of pure states that belong to bipartite systems and more general case of mixed states ...
    • Entanglement in atom-photon systems 

      Can, Muhammet Ali (Bilkent University, 2004)
      In this work we propose a new principle from the point of view of quantum fluctuations of observables. This new principle can be considered as an operational definition of ME states. Moreover, we show the existence of ...
    • Entanglement in local systems 

      Binicioğlu Çetiner, Sinem (Bilkent University, 2008)
      In this study, we first discuss entanglement measures and we introduce a way to construct generic entangled states of an n-level quantum system. Then we discuss entanglement as a local object. Particularly we use a ...
    • Evolution of the hofstadter butterfly in a tunable optical lattice 

      Yılmaz, Fırat (Bilkent University, 2015-08)
      There are a limited number of exact solutions for quantum mechanical systems. It is critical to obtain solutions for complex systems. One of these unsolved equations was the famous Harpers equation, which was proposed ...
    • Exciton condensate driven force in double layer systems 

      Özgün, Ege (Bilkent University, 2016-02)
      Excitonic systems are challenging to deal with both theoretically and experimentally but in return, they offer a very rich physics and exotic features. We will investigate their properties under weak magnetic field and ...
    • Exciton harvesting systems of nanocrystals 

      Mutlugün, Evren (Bilkent University, 2011)
      Semiconductor nanocrystals, also known as colloidal quantum dots, have gained substantial scientific interest for innovative light harvesting applications including those in biolabeling. Organic dyes and fluorescent ...
    • Extended phase diagram of ASEP with two types of particles 

      Yeşil, Ayşe Ferhan (Bilkent University, 2010)
      The ASEP (Asymmetric Simple Exclusion Process) model system with two types of particles is studied. The system is interesting because it exhibits spontaneous symmetry breaking when parameters controlling the dynamics of ...
    • Fabrication and characterization of amorphous silicon microcavities 

      Tanriseven, Selim (Bilkent University, 1999)
      In this thesis, planar amorphous silicon microcavities were fabricated and characterized at room temperature. Microcavities were realized by embedding the active amorphous silicon layer between distributed Bragg reflectors, ...
    • Fabrication and characterization of Bismuth Hall sensors at room temperature 

      Bayer, Gözde (Bilkent University, 2003)
      Small-scale Hall effect devices have attracted a great deal of research interest in recent years. It is well known that bulk single crystal of bismuth exhibit a large magnetoresistance effect and the recognition of this ...
    • Fabrication and characterization of GaAs and InAs hall sensors 

      Özdemir, Serdar (Bilkent University, 2004)
      Scanning Hall Probe Microscopy has become a widely used method for magnetic field measurements in the last decade. For Scanning Hall Probe Microscopy, low noise Hall sensors are fabricated from GaAs and InAs structures ...
    • Fabrication and characterization of high speed resonant cavity enhanced Schottky photodiodes 

      Islam, M Saiful (Bilkent University, 1996)
      High speed, high external quantum efficiency and narrow spectral linewidth make resonant cavity enhanced (RC E) Schottky photodetector a good candidate for telecommunication applications. In this thesis, we present our ...