Now showing items 1-5 of 5

    • 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.
    • 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 ...
    • 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 ...
    • Low-temperature thermodynamics of finite and discrete quartic quantum oscillator in one dimension 

      Sıddıki, Afif (Bilkent University, 1999)
      I.' this work we examined a quartic Hamiltonian using two different approaches. We first introduced a mean-field Gaussian approximation in order to handle this Hamiltonian analytically and observed that this approximation is ...
    • Phonon anomalies in high temperature superconductors 

      Türeci, E Hakan (Bilkent University, 1996)
      Anomalously large low temperature phonon anharmonicities can lead to static as well as dynamical changes in the low temperature properties of the vibrational system. In this work, we focus our attention on the low ...