Theses - Department of Physics
Faculty of Science
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Cumulants associated with geometric phases and their implementation in modern theory of crystalline polarization
(Bilkent University, 2022-09)Many fields have been influenced by Berry's geometric phase because of its physical meaning and observable effects. One of the breakthroughs that stem from geometric phases is the modern theory of polarization. The ... -
Dynamics of sliding and loading bilayer graphene
(Bilkent University, 2022-09)Sliding and loading bilayer graphene is investigated using the Tight Binding method. We develop interaction-distance dependent tight binding parameter functions to allow for the calculation of band structure for different ... -
Ten million-atom InGaAs embedded quantum dot electron g factor calculations using semi-empirical pseudopotentials
(Bilkent University, 2022-10)Quantum technologies rely on key capabilities such as electron spin control over the full-Bloch sphere, generation of indistinguishable single photons, or entangled photon pairs. For all these purposes, arguably the most ... -
Many-body theory explored optical properties of selected 2D group II-VI monochalcogenides
(Bilkent University, 2022-09)Two-dimensional (2D) metal oxides (MOs) and metal chalcogenides (MChs) are emerging classes of 2D materials. Depending on the constituent elements, these materials can display various electronic and optical properties ... -
A continuum equation displaying Tracy-Widom distribution in the spatial and temporal fluctuations of growing interfaces
(Bilkent University, 2022-09)A wide variety of surface growth phenomena involves random processes that result in correlated stochastic dynamics. Such dynamics is most succinctly described by a nonlinear equation known as the Kardar-Parisi-Zhang (KPZ) ... -
A study of the modern theory of polarization on extensions of one dimensional topological insulators and disordered systems
(Bilkent University, 2021-12)We work on identifying topological and quantum phase transition via the modern theory of polarization. We go through the problem of electrostatics definition of absolute polarization via a discrete chain of anions and ... -
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 ... -
Electronic structure and optical properties of monolayer semiconductors: a computational study
(Bilkent University, 2021-09)Interest on monolayer semiconductors is rapidly growing in recent years. One of the prominent members is hexagonal boron nitride (h-BN). At room tem-perature, it harbors an environment similar to semiconductor vacuum for ... -
Plasmonic metamaterial based structures for designing of multiband and thermally tunable light absorbers, multiple thermal infrared emitter, and high-contrast asymmetric transmission optical diode
(Bilkent University, 2021-07)Metamaterials with sub-wavelength nanostructures refer to a class of synthetic materials that possess exotic electromagnetic properties which cannot be observed with natural materials. Negative refractive index, asymmetric ... -
Extensions of one-dimensional topological insulator models and their properties
(Bilkent University, 2021-04)We mainly study the SSH model, a one dimensional topological insulator. As a start, we give a brief introduction about the model and theoretically showed that it should have at least 2 distinct states using Jackiw-Rebbi ... -
Electrostatics of polymer translocation through membrane nanopores in electrolyte solutions
(Bilkent University, 2021-02)The transport of polymers across membranes in electrolyte solutions happens in most biological systems and is necessary for cells to function. Moreover, the poly-mer translocation process has proven to be very important ... -
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 ... -
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 ... -
Optomechanically induced transparency in a PT symmetric system
(Bilkent University, 2020-08)Optomechanical systems have attracted attention recently in various areas of physics, and are widely used with the purpose of laser cooling, gravitational wave detection, preparation of entangled states, cooling of ... -
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 ... -
Atomic force microscopy experiments on atomically thin materials
(Bilkent University, 2020-06)In 2004, successful isolation of graphene attracted immense attention of scientists because of atomic scale thickness and exotic functionalities. Regardless of graphene’s thickness and extraordinary properties only reason ... -
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 ... -
A theoretical study of strained monolayer transition metal dichalcogenides based on simple band structures
(Bilkent University, 2019-10)This doctoral thesis deals with optoelectronic and geometric band properties of two-dimensional transition metal dichalcogenides (TMDs) under applied strain. First, we analyze various types of strain for the K valley ... -
Development of force fields for novel 2D materials for temperature dependent vibrational properties
(Bilkent University, 2019-09)A new era of nanodevice engineering has been started after fabricating graphene. This motivated vast number of researches for predicting, fabricating and utilizing 2D materials. Temperature dependent properties are ... -
A novel method for thermal conductivity measurement of two dimensional materials
(Bilkent University, 2019-09)Thermal conductivity is a quantity which governs the heat transfer in a material. After increasing importance of efficiency in power generation systems and cooling mechanisms in micro-structures, many measurement methods ...
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