Browsing Dept. of Physics - Master's degree by Title
Now showing items 64-83 of 170
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Haldane phase in the bond-alternating spin-1/2 XXZ chain: DMRG and fermionization studies
(Bilkent University, 2018-12)In this thesis, the subject of study is the Haldane phase in bond - alternating XXZ chain with S =1/2. We firstly mapped our model to the fermionic chain by the use of standard Jordan-Wigner Transformation, which leads ... -
Hard spin mean field theory of 3D stacked-triangular-lattice system
(Bilkent University, 1994)Closed form solution of ‘Hard spin mean field theory’ is constructed and applied to ‘Three dimensional stacked-triangular-system’. The phase diagram of this system is examined. ‘Free energy’ is calculated to reveal ... -
High field transport phenomena in wide bandgap semiconductors
(Bilkent University, 2003)The Ensemble Monte Carlo (EMC) method is widely used in the field of computational electronics related to the simulation of the state of the art devices. Using this technique our specific intention is to scrutinize the ... -
High pressure properties of metals from first principle calculations : gold as an example
(Bilkent University, 2004) -
High Tc superconductivity
(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 ... -
Hubbard model In Square Lattices: A Mean-field Hartree-fock Approach
(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 ... -
Hyperfine and electric quadrupolar interaction-driven loschmidt echo in nanoscale nuclear spin baths
(Bilkent University, 2018-07)Environmental dynamics in solid state matrix is of much importance for quantum information processing and storage purposes. Here, we first give a basic recipe to get Loschmidt echo (LE) which is a measure of decoherence ... -
Improvements in simulating discrete deposition models
(Bilkent University, 2021-11)The main purpose of this work is to describe the surface growth phenomena. Initially, we give a brief introduction to the analytical studies, in particular, done by di erential equations such as Edward-Wilkinson and ... -
Impurity effects and symmetry of the order parameter in high-temperature oxide superconductors
(Bilkent University, 1997)Identification of the symmetry of the order parameter (OP) of high-l'c cuprates is important because it helps to understand possible mechanism that govern the physics of these materials. However, up to now, there is no ... -
Impurity effects on superconductors and the electron-phonon interaction
(Bilkent University, 2000)In this thesis effects of impurities on superconductors and electron-phonon interactions in metals are studied. The first part deals with the effect of magnetic impurities on superconductors. In particular, we focus on ... -
Impurity-free quantum well intermixing for high-power laser diodes
(Bilkent University, 2015-08)The demand for ever higher powers and efficiencies from semiconductor lasers, continues. State-of-the-art high power lasers require not only sophisticated designs but also complex fabrication technologies to push the ... -
Integrated optical displacement sensors for scanning force microscopies
(Bilkent University, 2003)In this thesis, we have studied the use of integrated optical waveguide devices acting as integrated displacement sensors on cantilevers for scanning probe microscopes. These displacement sensors include integrated optical ... -
Intrinsic entanglement of photons
(Bilkent University, 2006)Multipole radiation is treated both classically and also quantum mechanically. Dipole atom as a source of radiation is investigated within the Jaynes-Cummings model. Polarization properties of quantum multipole radiation ... -
Investigation of dual-narrowband plasmonic perfect absorbers at visible frequencies for biosensing
(Bilkent University, 2019-12)Since the introduction of first plasmonic perfect absorber (PA) in early 2008 by Landy et al., numerous studies have demonstrated their superior optical performance in frequencies ranging from terahertz to visible region ... -
Investigation of optical residual absorption in graphene
(Bilkent University, 2018-02)Graphene, a 2-dimensional crystal of carbon, can absorb 2.3% of light over a very broad spectrum. Doped graphene, however has a gap in optical absorption due to the Pauli blocking principle. For doped graphene, the interband ... -
Investigation of the low temperature dynamics of a modified toric code
(Bilkent University, 2020-08)Topological quantum systems were introduced as an attempt to overcome the challenge of decoherence due to the self-correcting properties of their energy eigenstates. One of the simplest and most popular topologically ... -
Investigation of the magnetic properties of BSCCO superconductors with scanning Hall probe microscope
(Bilkent University, 2002)A low temperature scanning Hall probe microscope (LT-SHPM) with low noise GaAs/AlGaAs 2DEG Hall probes is used to investigate the magnetic properties of a Ag-sheathed BSCCO-2223 tape and a single crystal BSCCO-2212 ... -
Investigation of thermoelectric properties of 2D β-silicon monotelluride (site)
(Bilkent University, 2018-09)Thermoelectric properties of novel 2D silicon monotelluride (SiTe) are studied using first principles calculations. The plane wave method based on density functional theory as implemented in Vienna ab initio simulation ... -
Janus particles in a Gaussian optical potential: a comparative experimental study
(Bilkent University, 2020-07)It has been shown recently that gold coated silica Janus particles can cluster when subject to a smooth optical field due to the presence of an attractive interaction of hydrodynamic nature (1). Such an interaction comes ... -
Josephson effect in hybrid superconductor-normal metal structures
(Bilkent University, 2000)The clean SNS junction, with a phase difference x across the normal metal barrier and without Fermi level mismatch between the components, is modeled by a step like pair potential. The quasiclassical equations are obtained ...
