Now showing items 168-187 of 225

    • Quantum gases in rotating optical lattices 

      Umucalılar, Rifat Onur (Bilkent University, 2010)
      The thesis is structured into two main parts so as to cover bosons and fermions in rotating optical lattices separately. In the first part, after a brief introduction to ultracold atoms in optical lattices, we review the ...
    • Quantum Monte Carlo simulations of ultracold atomic systems 

      Akatürk, Emre (Bilkent University, 2019-07)
      Here, we present our work and findings on ultracold atomic systems. We first present a semi-analytical work on density wave instability (DWI) and collective modes of a bilayer dipolar system of bosons and fermions. We ...
    • Quantum polarization properties of radiation 

      Ünsal, Mithat (Bilkent University, 1999)
      New bosonic operators, describing the polarization properties of photons at any point with respect to a source, are introduced. It is shown that, unlike the classical picture, the local quantum description of polarization ...
    • Quantum properties of multipole radiation 

      Soykal, Öney Orhunç (Bilkent University, 2002)
      In this study, multipole expansion of quantum electromagnetic radiation is constructed and quantized by canonical transformation with increasing demand of some modern research areas of physics such as entanglement of the ...
    • Quantum statistics of light interacting with matter 

      Müstecaplıoğlu, ÖE (Bilkent University, 1999)
      Studies on some systems in which light interacts with matter are performed from quantum statistical point of view. As a result of these studies a novel effect which can be utilized for detecting squeezed phonons is ...
    • Rabi oscillations in an exciton-polariton system 

      Müstecaplıoğlu, Özgür Esat (Bilkent University, 1995)
      The pure qiiaiitum model d(\scril)ing lîahi oscillations of exciton-polaritons in a ınicro-cavity is consid(‘r(‘(l. IMiolon-c'Xcilon intiT’action Hamiltonian is diagonalized with the aid of Bogoliihov canonical transformations ...
    • Radiation properties of sources inside photonic crystals 

      Bulu, İrfan (Bilkent University, 2003)
      The control of spontaneous emission is an important problem both in basic and applied physics. Two main problems arise in the control of emission: enhancement or suppression and angular confinement of radiation. In this ...
    • Refractive index tuning with Burstein-Moss effect in Indium Nitrite under photoexcitation 

      Turgut, Cem Murat (Bilkent University, 2009)
      The band filling effect due to free carriers introduces a shift in the absorption edge, which in turn modifies the refractive index of the medium through the Kramers-Kronig relation. This is known as the Burstein-Moss ...
    • Repetition-rate stabilization of femtosecond stretched-spectrum fiber laser 

      Ülgüdür, Coşkun (Bilkent University, 2008)
      Passively modelocked lasers produce trains of femtosecond pulses, with the temporal separation between the pulses being determined by the length of the laser cavity. The repetition rate of the laser is inverse of this ...
    • Ridge waveguide GaAS 

      Türkoğlu, Abdullah Kamuran (Bilkent University, 1994)
      The study of solid-state laser structures in low dimensions has gained great deal of attention in recent years. The theory originated in early 1960s developed really fast along with new fabrication methods bringing ...
    • Robust entanglement in atomic systems 

      Çakır, Özgür (Bilkent University, 2005)
      Various models for generation of robust atomic entangled states and their implementation with current accessible technologies are proposed and worked out. Deterministic creation of long living Bell states with respect ...
    • Rotating two leg Bose Hubbard ladder 

      Keleş, Ahmet (Bilkent University, 2009)
      We analyze two leg Bose Hubbard model under uniform magnetic field within various methods. Before studying the model, we discuss the background on rotating Bose Einstein condensates, Bose Hubbard model and superfluid ...
    • Scanning hall probe microscopy (SHPM) using quartz crystal AFM feedback 

      Ürkmen, Koray (Bilkent University, 2005)
      Scanning Hall Probe Microscopy (SHPM) is a quantitative and non-invasive technique for imaging localized surface magnetic field fluctuations such as ferromagnetic domains with high spatial and magnetic field resolution ...
    • Selective plasmonic control of excitons and their non-radiative energy transfer in colloidal semiconductor quantum dot solids 

      Özel, Tuncay (Bilkent University, 2009)
      To date extensive research has proved that semiconductors and metals exhibit extraordinary optical properties in nano-dimensions compared to their bulk counterparts. For example, an interesting effect is observed in ...
    • Silicon and carbon based nanowires 

      Tongay, Sefaattin (Bilkent University, 2004)
      Nanowires have been an active field of study since last decade. The reduced dimensionality end size allowing electrons can propagate only in one direction has led to quantization which are rather different from the bulk ...
    • Silicon based dielectrics : growth, characterization, and applications in integrated optics 

      Ay, Feridun (Bilkent University, 2005)
      In recent years, growing attention has been paid to silicon based dielectrics, such as silicon oxynitrides, silicon nitrides, and semiconductor doped silicon oxides, all combined under the name silica on silicon technology. ...
    • Silicon nanocrystal doped polymer nanowire arrays 

      Çelebi, Muhammet (Bilkent University, 2013)
    • Silicon nanowire-based complex structures : A Large-scale atomistic electronic structure and ballistic transport 

      Keleş, Ümit (Bilkent University, 2014)
      While the hierarchical assembling as well as the dramatic miniaturization of Si nanowires (NWs) are on-going, an understanding of the underlying physics is of great importance to enable custom design of nanostructures ...
    • Silicon oxynitride layers for applications in optical waveguides 

      Ay, Feridun (Bilkent University, 2000)
    • Silicon-on-insulator optical waveguides and waveguide devices 

      Kiyat, İsa (Bilkent University, 2000)
      Silicon-on-insulator(SOI) optical waveguides, directional couplers and some types of MMI couplers were designed, fabricated and characterized at a wavelength of 1.55 /im. Effective index method and the single mode ...