Theses - Department of Physics
Faculty of Science
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First principles study of 2D gallium nitride and aluminium nitride in square-octagon structure
(Bilkent University, 2017-08)This thesis, deals with the planar free-standing, single-layer, square-octagon (SO) structures of GaN and AlN. We investigated single-layer and multilayer so-GaN and so-AlN structures, their stability, electronic properties ... -
Multi-exciton states in flexible Rydberg aggregates
(Bilkent University, 2017-07)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, 2017-03)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. ... -
Mixtures of charged-neutral superfluids
(Bilkent University, 2016-12)Motivated by the developments of artificial magnetic fields (AMFs) enabling cou- pling to the neutral particles of ultracold quantum gases, we have theoretically studied charged-neutral mixtures in various settings. The ... -
Analysis of nonequilibrium steady-states
(Bilkent University, 2016-12)Non-equilibrium is the state of the almost all systems in the universe. Unlike equilibrium systems, they interfere with their surroundings which results in never ceasing uxes. There is no unified theory to understand these ... -
Manipulation and control of collective behavior in active matter systems
(Bilkent University, 2016-11)Active matter systems consist of active constituents that transform energy into directed motion in a non-equilibrium setting. The interaction of active agents with each other and with their environment results in collective ... -
Calculation of masses of dark solitons in 1D Bose-Einstein condensates using Gelfand Yaglom method
(Bilkent University, 2016-11)Nonlinear excitations of Bose-Einstein 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 ... -
Novel approaches to ultrafast fiber laser design for ablation-cooled material removal
(Bilkent University, 2016-11)The past few decades in particular have witnessed the tremendous beneficial impact of innovations in laser technology ranging from biomedical to industrial applications in response to enhancing community's quality of life. ... -
Graphene-based electrically tunable terahertz optoelectronics
(Bilkent University, 2016-11)Advances in terahertz (THz) research and technology, has bridged the gap between radio-frequency electronics and optics. More efficient control of THz waves would highly benefit noninvasive, high-resolution imaging ... -
Non-boltzmann stationary distributions and non-equilibrium relations in active baths
(Bilkent University, 2016-10)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 quasi-two-dimensional materials from the Prandtl-Tomlinson model
(Bilkent University, 2016-10)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 bose-einstein condensate in a cylindrically symmetric trap
(Bilkent University, 2016-08)Bose-Einstein 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 self-assembled patterns by microorganisms in evaporating droplets
(Bilkent University, 2016-08)The science of self-organization 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 ... -
Physics of nonradiative energy transfer in the complex media of 0D, 2D and 3D materials
(Bilkent University, 2016-08)Quantum-confined colloidal nanostructures with strong excitonic properties have emerged as promising light harvesting components in photonics and optoelectronics over the past 20 years. With their favorable photophysical ... -
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 ... -
Novel hybrid light emitting diodes with multiple assemblies of nanocrystals to generate and tune white light
(Bilkent University, 2007)Today approximately one third of the world population (about two billion people) in under-developed countries has no access to electricity and relies on unhealthy, costly and low-quality fuel-based lighting for home ... -
Novel approaches to control the propagation of electromagnetic waves : metamaterials and photonic crystals
(Bilkent University, 2007)Applications in areas such as photonics, antennas, imaging and optics require the control of propagation of electromagnetic waves and the control of emission of electromagnetic radiation. Achievements in three key research ... -
Phonon-coupling and magnetic fields effects on the binding energy of a hydrogenic impurity in two dimensions
(Bilkent University, 2006)Electron-phonon interaction and ınagne t ic field effects on a two-dimensional electran bound to a Coulomb center is st udied within the fraınework of a variational appıoxinıat ion consisting of an adiabatic polaronic wave ...
