Now showing items 1-20 of 70

    • A1GaN UV photodetectors : from micro to nano 

      Bütün, Serkan (Bilkent University, 2011)
      The absorption edge of AlGaN based alloys can be tuned from deep UV to near UV by changing the composition. This enables the use of the material in various technological applications such as military, environmental ...
    • The adiabatic and non-adiabatic behavior of a particle in optical lattices 

      Yılmaz, Fırat (Bilkent University, 2018-06)
      The cold atom experiments provide a clean and controlled environment for realizing many body systems. Recent realizations of artificial gauge fields and adjustable optical lattices paved the way for the study of effectively ...
    • Analysis of nonequilibrium steady-states 

      Yeşil, Ayşe Ferhan (Bilkent University, 2016-12)
      Non-equilibrium is the state of the almost all systems in the universe. Unlike equilibrium systems, they interfere with their surroundings which results in never ceasing uxes. There is no unified theory to understand these ...
    • Ballistic transport and tunneling in small systems 

      Tekman, A Erkan (Bilkent University, 1990)
      Ballistic transport and tunneling of electrons in mesoscopic systems have become one of the most important subjects of condensed matter physics. The quantum point contacts and scanning tunneling microscope form the basic ...
    • Beaming and localization of electromagnetic waves in periodic structures 

      Çağlayan, Hümeyra (Bilkent University, 2010)
      We want to manipulate light for several applications: microscopy, data storage, leds, lasers, modulators, sensor and solarcells to make our life healthier, easier or more comfortable. However, especially in small scales ...
    • Boron nitride and graphene 2D nanostructures from first-principles 

      Ovalı, Rasim Volga (Bilkent University, 2010)
      In this thesis, the structures as well as mechanical and electronic properties of various boron nitride (BN) and graphene based two dimensional (2D) nano-structures are investigated in detail from rst-principle calculations ...
    • Carrier dynamics in silicon and Germanium nanocrystals 

      Sevik, Cem (Bilkent University, 2008)
      This is a computational work on the Si and Ge nanocrystals (NCs) embedded in wide band gap host matrices. As the initial task, extensive ab initio work on the structural and electronic properties of various NC host ...
    • Chalcogenide micro and nanostructures and applications 

      Aktaş, Ozan (Bilkent University, 2014)
      Chalcogenides, which are glasses consist of S, Se and Te elements, are promising materials for photonics as silicon for modern electronics, due to their extraordinary material properties such as high nonlinearity and ...
    • Characterization and applications of negative-index metamaterials 

      Aydın, Koray (Bilkent University, 2008)
      Metamaterials offer novel electromagnetic properties and promising applications including negative refraction, flat-lenses, superlenses, cloaking devices. In this thesis, we characterized the negative-index metamaterials ...
    • Controlling electromagnetic waves with active graphene devices 

      Balcı, Osman (Bilkent University, 2015)
    • 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 ...
    • 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 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 ...
    • 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 ...
    • 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 ...