Now showing items 48-67 of 71

    • On the strain in silicon nanocrystals 

      Yılmaz, Dündar (Bilkent University, 2009)
      In this Thesis we present our achievements towards an understanding of atomistic strain mechanisms and interface chemistry in silicon nanocrystals. The structural control of silicon nanocrystals embedded in amorphous ...
    • Optical and thermal dynamics of long wave quantum cascade lasers 

      Gündoğdu, Sinan (Bilkent University, 2018-09)
      Quantum Cascade Lasers (QCLs) are coherent light sources that make use of intraband transitions of wavefunction engineered semiconductor quantum wells. They have been designed to emit light in a wide spectral range; from ...
    • Physics and applications of coupled-cavity structures in photonic crystals 

      Bayındır, Mehmet (Bilkent University, 2002)
      We proposed and demonstrated a new type of propagation mechanism for the electromagnetic waves in photonic band gap materials. Photons propagate through coupled cavities due to interaction between the highly localized ...
    • Physics and applications of photonic crystals 

      Temelkuran, Burak (Bilkent University, 2000)
      We first fabricated a dielectric based layer-by-layer photonic crystal, with a three-dimensional photonic band gap at microwave frequencies. We investigated the transmission, reflection and defect characteristics of the ...
    • Physics of nonradiative energy transfer in the complex media of 0D, 2D and 3D materials 

      Yeltik, Aydan (Bilkent University, 2016-08)
      Quantum-confined colloidal nanostructures with strong excitonic properties have emerged as promising light harvesting components in photonics and optoelectronics over the past 20 years. With their favorable photophysical ...
    • Plasmonic band gap cavities 

      Kocabaş, Aşkın (Bilkent University, 2008)
      Surface plasmon polaritons (SPP’s) are trapped electromagnetic waves coupled to free electrons in metals that propagate at the metal-dielectric interfaces. Due to their surface confinement and potential in sub-wavelength ...
    • Plasmonic nanoantennas for enhanced light-matter interactions and graphene based tunable nanophotonic devices 

      Çakmakyapan, Semih (Bilkent University, 2015)
      Focusing, manipulating and beaming of electromagnetic waves are important for many applications such as antennas, optical isolators, biological sensor, chemical sensors, and solar cells. There is an extensive research ...
    • 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 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 ...
    • 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 ...
    • 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 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 ...
    • Size controlled germanium nanocrystals in dielectrics : structural and optical analysis and stress evolution 

      Bahariqushchi, Rahim (Bilkent University, 2017-09)
      Group IV semiconductor nanocrystals, namely silicon and germanium have attracted much interest in the past two decades due to their broad applications in photovoltaic, memory, optoelectronic, medical imaging and ...
    • Spintronic properties of carbon and silicon based nanostructures 

      Durgun, Engin (Bilkent University, 2007)
      In this thesis, nanostructures which may display novel spintronic behaviors are revealed and their properties are investigated by using first-principles methods. We have concentrated on three different systems, namely ...
    • Strongly correlated models of high-temperature superconductivity 

      Boyacı, Hüseyin (Bilkent University, 1999)
      Son zamanlarda nanometrc büyüklüğündeki örneklerle ya|)dan tek ek'ktron ta.^ınma deneyleri, üstün iletkenlerin büyüklüklerinin alt sının ile ilgili soruyu yeniden gündeme getirmiştir, iler ne kadar, belirsiz tanecik ...
    • Structural and electronic properties of carbon-based materials 

      Kılıç, Çetin (Bilkent University, 2000)
      In this thesis, some carbon-based materials in nano scale have been investigated by using first-principles methods as well as transferable tight-binding and empirical potential models. The focus of interest has been in ...
    • Superconducting systems of low dimensionality 

      Gedik, M. Zafer (Bilkent University, 1992)
      It is possible to call the last five years as the golden age of superconductivity. The two most important developments in the field are the discovery of copper oxide and fullerene superconductors. In this work, some ...
    • Theory of atomic scale friction 

      Buldum, Alper (Bilkent University, 1998)
      Friction is an old and important but at the same time very complex physical event. This thesis aims to develop an atomic scale theory of friction. VVe investigate various atomic processes and stick-slip motion by using ...