Now showing items 1-20 of 23

    • Adsorption and dissociation of hydrogen molecule on carbon nanotubes 

      Öztürk, Yavuz (Bilkent University, 2004)
      Earlier, it has been suggested that carbon nanotubes can provide high storage capacity and other physical properties suitable for the fuel cell technologies. In this thesis we have investigated adsorption, desorption and ...
    • Atomic theory of the scanning tunneling microscope 

      Tekman, Ahmet Erkan (Bilkent University, 1988)
      The Scanning Tunneling Microscope is proven to be one of the most powerful tools for surface structure determination. Present theories are able to explain the operation of the microscope when the tip is far from the ...
    • 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 ...
    • Bias voltage control of a molecular spin valve 

      Can, Duygu (Bilkent University, 2009)
      With the discovery of giant magneto resistance a new field called spintronics is emerged. Utilizing spin-degree of freedom of the electron as well as its charge, high-speed devices which consumes low energy can be designed. ...
    • Controlled lateral and perpendicular motion of atoms on metal surfaces 

      Buldum, Alper (Bilkent University, 1994)
      Nanoscale modification of matter has been the subject of interest. Recently, several experimental studies have demonstrated that by using a scanning tunneling microscope one can translate atoms on metal surfaces to a ...
    • 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 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 ...
    • First principles study of 2D gallium nitride and aluminium nitride in square-octagon structure 

      Gürbüz, Emel (Bilkent University, 2017-08)
      This thesis, deals with the planar free-standing, single-layer, square-octagon (SO) structures of GaN and AlN. We investigated single-layer and multilayer so-GaN and so-AlN structures, their stability, electronic properties ...
    • Functionalization of carbon nanotubes 

      Dağ, Sefa (Bilkent University, 2005)
    • High Tc superconductivity 

      Gedik, M. Zafer (Bilkent University, 1989)
      critical summary of the recent developments in high temperature superconductivity is given. Physical properties of the new materials are summarized. The new theories proposed to explain high Tc are reviewed. In the case ...
    • Magnetism of transition metal nanowires 

      Ataca, Can (Bilkent University, 2008)
      In this thesis we investigated structural, electronic and magnetic properties of 3d (light) transition metal (TM) atomic chains and Cr nanowires using firstprinciples pseudopotential plane wave calculations. Infinite ...
    • Metal coverage on single-wall carbon nanotubes : metal nanoring and nanotube formation 

      Bağcı, V M Kemal (Bilkent University, 2002)
      The carbon nanotubes are welcomed as the basis element for electronic and opto-electronic devices of nanometers size, the size of a few atoms. The question of crucial importance in the physics of utilization of nanotubes ...
    • A microscopic approach to phononic energy transfer in nano structures 

      Özpineci, Altuğ (Bilkent University, 1999)
      Understanding of mechanisms for the energy transfer from and/or through nano particles in contact with the large samples have become important in various biological processes, molecular electronics and friction. In this ...
    • Nanoscience for sustainable energy production 

      Ataca, Can (Bilkent University, 2011)
      Hydrogen economy towards the utilization of hydrogen as a clean and sustainable energy source has three ingredients. These are (i) hydrogen production; (ii) hydrogen storage; and (iii) fuel cells. Optimization of fuel ...
    • 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 ...
    • 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 ...
    • 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 ...
    • A study of adsorption of single atoms on carbon nanotubes 

      Durgun, Engin (Bilkent University, 2003)
      The adsorption of individual atoms on the semiconducting and metallic singlewall carbon nanotubes (SWNT) have been investigated by using first-principles pseudopotential plane wave method within Density Functional Theory. ...