Dept. of Physics  Master's degree
Recent Submissions

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 ... 
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 ... 
Sonic Hawking Radiation from a blackhole laser
(Bilkent University, 201806)The quantum thermal radiation from a black hole (BH) known as “Hawking Radiation” or “Black Hole Evaporation” results from studying quantum fields in the curved spacetime of the horizon of a BH. Experimentally, the ... 
Investigation of optical residual absorption in graphene
(Bilkent University, 201803)Graphene, a 2dimensional 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 ... 
Modeling of semiconductor devices based on quantum wells: quantum cascade laser as an example
(Bilkent University, 201802)It has been two decades since the quantumcascade 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 ... 
Model description of friction on planar and buckled two dimensional materials
(Bilkent University, 201801)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 ... 
Tight binding modeling of two dimensional and quasitwo dimensional materials
(Bilkent University, 201710)Since the advent of graphene, twodimensional (2D) materials have consistently been studied owing to their exceptional electronic and optical properties. While graphene is completely twodimensional in nature, its other ... 
Energy and angular momentum transfer with circular Rydberg states
(Bilkent University, 201708)Circular states belong to a class of Rydberg states having maximum angular momentum. These states, compared to other Rydberg states, have longer lifetimes, and in the classical limit resemble circular Bohrlike orbits. ... 
Analysis of the magnetic translation group and investigation of a onedimensional topological model
(Bilkent University, 201708)The periodicity of a space lattice in presence of a uniform magnetic eld is preserved. During this thesis, we will study a set of modi ed translation operators which commute with the e ective Hamiltonian of an electron ... 
First principles study of 2D gallium nitride and aluminium nitride in squareoctagon structure
(Bilkent University, 201708)This thesis, deals with the planar freestanding, singlelayer, squareoctagon (SO) structures of GaN and AlN. We investigated singlelayer and multilayer soGaN and soAlN structures, their stability, electronic properties ... 
Multiexciton states in flexible Rydberg aggregates
(Bilkent University, 201707)Flexible Rydberg aggregates, assemblies of highly excited atoms, provide a platform to investigate quantum phenomena like energy transport and conical intersections. This can be achieved by doping the aggregate with an ... 
Braph : a toolbox developed for brain graph analysis of various imaging modalities
(Bilkent University, 201703)Complex systems, like the human brain, are composed of a huge number of interacting elements showing complex patterns. Graph theory provides a mathematical toolbox for investigating the role of each element in these systems. ... 
Calculation of masses of dark solitons in 1D BoseEinstein condensates using Gelfand Yaglom method
(Bilkent University, 201611)Nonlinear excitations of BoseEinstein condensates (BEC) play important role in understanding the dynamics of BECs. Solitons, shape preserving wave packets, are the most fundamental nonlinear excitations of BECs. They ... 
Nonboltzmann stationary distributions and nonequilibrium relations in active baths
(Bilkent University, 201610)Most natural and engineered processes, such as biomolecular reactions, protein folding, and population dynamics, occur far from equilibrium and, therefore, can not be treated within the framework of classical equilibrium ... 
Frictional properties of quasitwodimensional materials from the PrandtlTomlinson model
(Bilkent University, 201610)Tribology, the study of friction, is both an old theoretical problem in physics and an area of great practical importance. The invention of experimental instruments such as Atomic Force Microscope (AFM) has lead to the ... 
Dipolar boseeinstein condensate in a cylindrically symmetric trap
(Bilkent University, 201608)BoseEinstein Condensate (BEC) and particularly its stability dynamics has been a subject to many investigations since the first realization of this new condensed state in alkali atoms interacting via short range potential. ... 
Alteration of selfassembled patterns by microorganisms in evaporating droplets
(Bilkent University, 201608)The science of selforganization comprises a diverse range of processes where a disordered system of components form ordered pattern or structure spontaneously without any external instruction [1]. Plentiful examples of ... 
Study of anisotropic particles in active bath
(Bilkent University, 2015)Brownian (passive) particles undergo random motion due to thermal agitation in the surrounding medium. In recent years, a lot of attention has been devoted to study active Brownian particles, i.e., microscopic particles ... 
Quantum properties of multipole radiation
(Bilkent University, 2002)In this study, multipole expansion of quantum electromagnetic radiation is constructed and quantized by canonical transformation with increasing demand of some modern research areas of physics such as entanglement of the ... 
Dynamical effects of noise on nonlinear systems
(Bilkent University, 2014)Randomness and nonlinear dynamics consitute the most essential part of many events in nature. Therefore, a better and comprehensive understanding of them is a crucial step in describing natural phenomena as well as the ...