Now showing items 32-51 of 225

    • Dark current control in InAs/GaSb superlattice photodetectors 

      Muti, Abdullah (Bilkent University, 2013)
      Bose-Einstein Condensation (BEC) was introduced by Einstein 1925. It took 70 years to confirm BEC by experiments. BEC creates a suitable environment to observe macroscopic-quantum behavior. Condensates consist of ultracold ...
    • Decoherence in open quantum systems : a realistic approach 

      Savran, Kerim (Bilkent University, 2006)
      Decoherence mechanisms of opcu quantum systems ın intcraction with an enviromental bath is investigated using the master equation formalism. Widely used two-level approximation is questioned.
    • Deformation and finite size effects in cooperative molecular motors 

      Taneri, Sencer (Bilkent University, 2002-07)
      Motor protein systems have been of considerable interest lately. In these studies muscle contraction is modeled as the sliding of two filaments made of protein particles over one another, that is the sliding of the ...
    • Development of force fields for novel 2D materials for temperature dependent vibrational properties 

      Mobaraki, Arash (Bilkent University, 2019-09)
      A new era of nanodevice engineering has been started after fabricating graphene. This motivated vast number of researches for predicting, fabricating and utilizing 2D materials. Temperature dependent properties are ...
    • Dipolar bose-einstein condensate in a cylindrically symmetric trap 

      Gültekin, Habib (Bilkent University, 2016-08)
      Bose-Einstein Condensate (BEC) and particularly its stability dynamics has been a subject to many investigations since the first realization of this new condensed state in alkali atoms interacting via short range potential. ...
    • Dynamical effects of noise on nonlinear systems 

      Duman, Özer (Bilkent University, 2014)
      Randomness and nonlinear dynamics consitute the most essential part of many events in nature. Therefore, a better and comprehensive understanding of them is a crucial step in describing natural phenomena as well as the ...
    • Dynamics of a two leg ladder under a time dependent artificial magnetic field 

      Keskiner, Mehmet Akif (Bilkent University, 2019-09)
      Especially in the last two decades, there have been intensive theoretical and experimental studies on the periodically driven quantum systems. The reasons for these intensive studies are the emergence of new topological ...
    • 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 ...