Theses - Department of Physics
Faculty of Science
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A Monte Carlo study of Maxwell’s demon coupled to finite quantum heat baths
(Bilkent University, 2020-09)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, 2020-09)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, 2020-09)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, 2020-08)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, 2020-07)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, 2019-11)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 ... -
Temperature dependent density profiles and collective oscillations of dipolar droplets
(Bilkent University, 2019-09)Dipolar droplets are a novel form of Bose gas that form in a regime where the mean field theory predicts collapse. In the literature, the beyond mean field e ects in the form of the Lee-Huang-Yang correction to the local ... -
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 ... -
Dynamics of a two leg ladder under a time dependent artificial magnetic field
(Bilkent University, 2019-09)Especially in the last two decades, there have been intensive theoretical and experimental studies on the periodically driven quantum systems. The reasons for these intensive studies are the emergence of new topological ... -
Quantum Monte Carlo simulations of ultracold atomic systems
(Bilkent University, 2019-07)Here, we present our work and findings on ultracold atomic systems. We first present a semi-analytical work on density wave instability (DWI) and collective modes of a bilayer dipolar system of bosons and fermions. We ... -
Intracavity optical trapping with fiber laser
(Bilkent University, 2019-06)After Ashkin's seminal works, optical trapping has been a powerful technique for capturing and manipulating sub micro particles not only in physics research fields but also in biology and photonics. Standard optical ... -
Topological aspects of charge transport in quantum many-body systems
(Bilkent University, 2019-02)Motivated by the recent proposals and developments of topological insulators and topological superconductors for their potential applications in electronic devices and quantum computing, we have theoretically studied ... -
Haldane phase in the bond-alternating spin-1/2 XXZ chain: DMRG and fermionization studies
(Bilkent University, 2019-01)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 ... -
Novel concepts in high power semiconductor lasers
(Bilkent University, 2018-12)This doctoral thesis deals with innovations to the cavity optics of high power semiconductor lasers emitting light at 9xx nm. High power laser diodes are complex electronic and photonic systems. Developments in epitaxial ... -
Ground state energy of the fröhlich polaron as a function of dimensionality and the phonon coupling strength
(Bilkent University, 2018-09)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 ... -
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 ... -
Optical and thermal dynamics of long wave quantum cascade lasers
(Bilkent University, 2018-09)Quantum Cascade Lasers (QCLs) are coherent light sources that make use of intraband transitions of wavefunction engineered semiconductor quantum wells. They have been designed to emit light in a wide spectral range; from ...
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