Browsing Dept. of Physics  Master's degree by Title
Now showing items 5473 of 170

GaAs/AlGaAs polarization splitting directional couplers
(Bilkent University, 1997)Directional couplers are building blocks for m any guided wave devices in integrated optics and optoelectronics. They have been used as switches, modulators, wavelength filters, power dividers, wavelength m ultiplexerdem ... 
Gain measurements via spontaneous emission in quantum well semiconductor lasers
(Bilkent University, 1996)111 this work ail analysis of gain in single ciianliini well last'rs as a riinction of sonu' of llu'ir o)(M’alioiial paranu'l('rs is earrii'd oiil. I^'irsl, a 1 li('or('liea.l inodi'l of gain is )resent('d. 'riuMi two ... 
Germanium alloys for optoelectronic devices
(Bilkent University, 2008)Silicon has been the backbone of the mainstream electronics of the last fifty years. It is however, used in conjunction with other matierals, mainly with its oxides and nitrides. Germanium, on the other hand, is also a ... 
Graphene based high frequency electronics
(Bilkent University, 2010)Recent advances in chemical vapor deposition of graphene on large area substrates stimulate a significant research effort in order to search for new applications of graphene in the field of unusual electronics such as ... 
Grating based plasmonic cavities
(Bilkent University, 2009)Surface plasmon polaritons are dipole carrying electromagnetic excitations occur ing at metaldielectric interfaces. Metallic periodic structures exhibit modi¯ed transmission and re°ection spectra owing to the interaction ... 
Grating loaded integrated optical cantilevers
(Bilkent University, 2010)Cantilever beams are the most important parts of standard scanning probe microscopy. In this work, an integrated optical approach to sense the deflection of a cantilever beam is suggested and realized. A grating coupler ... 
Gravitational waves from binary black hole systems in inspiralling phase
(Bilkent University, 201807)Binary black hole systems have three phases: inspiralling, merger and ringdown phases. This thesis is a review of methods developed to study the inspiralling phase analytically. Those methods include post Minkowskian ... 
Ground state energy of the fröhlich polaron as a function of dimensionality and the phonon coupling strength
(Bilkent University, 201809)We use the trial polaron wave function introduced by Devreese et al. [1] to estimate the ground state energies of the Fröhlich polaron over a broad range of the phonon coupling strength by a variational approach. We ... 
Groundstate properties of doublewire semiconducting systems
(Bilkent University, 1997)With the recent advances in nanometerscale semiconductor device fabrication technology, it became experimentally possible to produce strongly confined electron systems. Quantum wires are among these systems, and are ... 
The growth, fabrication and characterization of high performance AI(formula)Ga(formula)N metalsemiconductormetal photodiodes
(Bilkent University, 2006)High performance UV photodetectors have attracted unwarranted attention for various applications, such as in military, telecommunication, and biological imaging, as an AlxGa1xN material system is also rather suitable ... 
Haldane phase in the bondalternating spin1/2 XXZ chain: DMRG and fermionization studies
(Bilkent University, 201812)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 JordanWigner Transformation, which leads ... 
Hard spin mean field theory of 3D stackedtriangularlattice system
(Bilkent University, 1994)Closed form solution of ‘Hard spin mean field theory’ is constructed and applied to ‘Three dimensional stackedtriangularsystem’. 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 Meanfield Hartreefock Approach
(Bilkent University, 2005)This thesis is mainly an effort to reproduce the wellknown results that HartreeFock approximation gives for the Hubbard Model in two dimensions. As the area of application magnetic phases in the finitesize square ... 
Hyperfine and electric quadrupolar interactiondriven loschmidt echo in nanoscale nuclear spin baths
(Bilkent University, 201807)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, 202111)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 EdwardWilkinson and ... 
Impurity effects and symmetry of the order parameter in hightemperature oxide superconductors
(Bilkent University, 1997)Identification of the symmetry of the order parameter (OP) of highl'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 electronphonon interaction
(Bilkent University, 2000)In this thesis effects of impurities on superconductors and electronphonon interactions in metals are studied. The first part deals with the effect of magnetic impurities on superconductors. In particular, we focus on ...