Browsing Dept. of Physics - Ph.D. / Sc.D. by Title
Now showing items 1-20 of 76
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A1GaN UV photodetectors : from micro to nano
(Bilkent University, 2011)The absorption edge of AlGaN based alloys can be tuned from deep UV to near UV by changing the composition. This enables the use of the material in various technological applications such as military, environmental ... -
The adiabatic and non-adiabatic behavior of a particle in optical lattices
(Bilkent University, 2018-06)The cold atom experiments provide a clean and controlled environment for realizing many body systems. Recent realizations of artificial gauge fields and adjustable optical lattices paved the way for the study of effectively ... -
Analysis of nonequilibrium steady-states
(Bilkent University, 2016-11)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 ... -
Ballistic transport and tunneling in small systems
(Bilkent University, 1990)Ballistic transport and tunneling of electrons in mesoscopic systems have become one of the most important subjects of condensed matter physics. The quantum point contacts and scanning tunneling microscope form the basic ... -
Beaming and localization of electromagnetic waves in periodic structures
(Bilkent University, 2010)We want to manipulate light for several applications: microscopy, data storage, leds, lasers, modulators, sensor and solarcells to make our life healthier, easier or more comfortable. However, especially in small scales ... -
Boron nitride and graphene 2D nanostructures from first-principles
(Bilkent University, 2010)In this thesis, the structures as well as mechanical and electronic properties of various boron nitride (BN) and graphene based two dimensional (2D) nano-structures are investigated in detail from rst-principle calculations ... -
Carrier dynamics in silicon and Germanium nanocrystals
(Bilkent University, 2008)This is a computational work on the Si and Ge nanocrystals (NCs) embedded in wide band gap host matrices. As the initial task, extensive ab initio work on the structural and electronic properties of various NC host ... -
Chalcogenide micro and nanostructures and applications
(Bilkent University, 2014)Chalcogenides, which are glasses consist of S, Se and Te elements, are promising materials for photonics as silicon for modern electronics, due to their extraordinary material properties such as high nonlinearity and ... -
Characterization and applications of negative-index metamaterials
(Bilkent University, 2008)Metamaterials offer novel electromagnetic properties and promising applications including negative refraction, flat-lenses, superlenses, cloaking devices. In this thesis, we characterized the negative-index metamaterials ... -
Controlling electromagnetic waves with active graphene devices
(Bilkent University, 2015) -
Decoherence in open quantum systems : a realistic approach
(Bilkent University, 2006)Decoherence mechanisms of opcu quantum systems ın intcraction with an enviromental bath is investigated using the master equation formalism. Widely used two-level approximation is questioned. -
Deformation and finite size effects in cooperative molecular motors
(Bilkent University, 2002-07)Motor protein systems have been of considerable interest lately. In these studies muscle contraction is modeled as the sliding of two filaments made of protein particles over one another, that is the sliding of the ... -
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 ... -
Development of nano hall sensors for high resolution scanning hall probe microscopy
(Bilkent University, 2008) -
Electro-magnetic properties and phononic energy dissipation in graphene based structures
(Bilkent University, 2008)With the synthesis of a single atomic plane of graphite, namely graphene honeycomb structure, active research has been focused on the massless Dirac fermion behavior and related artifacts of the electronic bands crossing ... -
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 ... -
Electronic structure of graphene under the influence of external fields
(Bilkent University, 2012)In this thesis, the electronic structure of graphene under the influence of external fields such as strain or magnetic fields is investigated by using tight-binding method. Firstly, we study graphene for a band gap opening ... -
Electronic structure of low dimensional semiconductor systems
(Bilkent University, 1992)Recent progress made in the growth techniques has led to the fabrication of the artificial semiconductor systems of lower dimension. Electrons and holes in these materials have quantization different from those of the ... -
Entanglement : quantification via uncertainties and search among ultracold bosons in optical lattices
(Bilkent University, 2009)In the first part of the Thesis, the known measures of entanglement for finite dimensional systems are reviewed. Both the simplest case of pure states that belong to bipartite systems and more general case of mixed states ... -
Entanglement in atom-photon systems
(Bilkent University, 2004)In this work we propose a new principle from the point of view of quantum fluctuations of observables. This new principle can be considered as an operational definition of ME states. Moreover, we show the existence of ...
