Browsing Dept. of Physics - Master's degree by Title
Now showing items 82-101 of 170
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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 ... -
Large-scale semi-empirical pseudopotential electronic structure of self-assembled ingaas quantum dots
(Bilkent University, 2018-08)The so-called second quantum revolution emerged at the beginning of the second millennium, opening up a path to realization of spin-qubit-based quantum computing by means of controlling and protecting quantum coherent ... -
Light scattering from core-shell nano-structures : structural coloration
(Bilkent University, 2013)In this work, we produced kilometer-long semiconducting cylindrical nanostructures by using a top-to-bottom nano-fabrication technique which was recently developed in our research group. Comparison of commonly used ... -
Logistic cellular automata
(Bilkent University, 2019-09)Cellular Automata (CA), initially formalized to investigate self-reproducing constructions, are among the most frequently used tools to model and understand complex systems. These computational frameworks are de ned in ... -
Long wavelength GaAs based hot electron photoemission detectors
(Bilkent University, 1999)The increasing rate of telecommunication alters both science and technology, and demands high performance components. Photo detectors are essential components of optoelectronic integrated circuits and fiber optic ... -
Low dimensional structures for optical and electrical applications
(Bilkent University, 2008)Low dimensional structures such as quantum dots have been particularly attractive because of their fundamental physical properties and their potential applications in various devices in integrated optics and microelectronics. ... -
Low loss optical waveguides and polarization splitters with oxidized AlxGa1-xAs layers
(Bilkent University, 1998)Low propagation loss waveguides, operating at 1.55 fim optical wavelength, are fabricated utilizing oxidized AhGai_a;As layers. MBE grown multilayer semiconductor heterostructures are characterized before and after ... -
Low-temperature thermodynamics of finite and discrete quartic quantum oscillator in one dimension
(Bilkent University, 1999)I.' this work we examined a quartic Hamiltonian using two different approaches. We first introduced a mean-field Gaussian approximation in order to handle this Hamiltonian analytically and observed that this approximation is ... -
Magnetism of transition metal nanowires
(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 ... -
Many-body properties of one-dimensional systems with contact interaction
(Bilkent University, 1999)The one-dimensional electron systems are attracting a lot of interest because of theoretical and technological implications. These systems are usually fabricated on two-dimensional electron systems by confining the ... -
Mean-field renormalization group theory of the t-J model
(Bilkent University, 2002)The quantum nature of the high temperature superconductivity models makes analytical approaches to these systems almost impossible to implement. In this thesis, a computational study of the one and two dimensional t − J ... -
Mechanical and electronic properties of metal chain nanowires
(Bilkent University, 2003)The fabrication of stable gold monoatomic chains suspended between two gold electrodes is one of the milestones in nanoscience and technology, since miniaturization of the electronic components is one of the great ... -
Metal coverage on single-wall carbon nanotubes : metal nanoring and nanotube formation
(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 ... -
Microfabrication of micro Hall sensors on GaAs and INSB for scanning hall probe microscopy
(Bilkent University, 2001)Different techniques have been developed to investigate the surface magnetic structure of materials, including Hall probe, scanning superconductivity quantum interference device (SQUID) and magnetic force microscopies ... -
Microfluidic based differential electrochemical sensors
(Bilkent University, 2013)Lab-on-a-chip systems aim to integrate analytical techniques on a single chip to achieve high-throughput measurements with little reagent. Microfluidic devices use the advantage of fluid dynamics in microscale to generate ... -
A microscopic approach to phononic energy transfer in nano structures
(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 ... -
Model description of friction on planar and buckled two dimensional materials
(Bilkent University, 2018-01)The law of friction has been known since the 18th century but yet, the development on the tribology field was established in the last decades mainly by the invention of frictional force microscope (FFM), which enabled ... -
Modeling of semiconductor devices based on quantum wells: quantum cascade laser as an example
(Bilkent University, 2018-02)It has been two decades since the quantum-cascade lasers (QCLs) have emerged in 1994 for the first time. As time goes on, QCLs reach to higher points scientifically and economically and the usage of QCLs devices continually ... -
A Monte Carlo study of Maxwell’s demon coupled to finite quantum heat baths
(Bilkent University, 2020-08)When Maxwell’s demon was introduced, it raised the question: Is there a way to decrease an isolated system’s entropy, even though it was forbidden by the second law of thermodynamics. Then, a new idea which considered ...
