Browsing Theses - Department of Physics by Title
Now showing items 136-155 of 225
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Non-equilibrium steady state phase transitions of various statistical models
(Bilkent University, 2013)Non-equilibrium phase transitions of a number of systems are investigated by several methods. These systems are in contact with thermal baths with different temperatures and taken to be driven to the non-equilibrium ... -
Nonlinear and far-from-equilibrium dynamics of optical pulses in fiber oscillators
(Bilkent University, 2017-08)Fundamentals of mode locking of lasers have been extensively studied and well established for the last three decades. However, it continues to be an intensely studied field. The continued interest is, in part, due to the ... -
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 ... -
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. ... -
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 ... -
Novel design-based complex nanostructures in hybrid core-shell architectures for high-efficiency light generation
(Bilkent University, 2010)Recent developments in nanoscience and nanotechnology have given rise to the discovery of hybrid nanostructured multi-component materials that serve several tasks all at once. A very important and rapidly growing field ... -
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 ... -
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 ... -
Novel ultraviolet scintillators based on semiconductor quantum dot emitters for significantly enhanced photodetection and photovoltaics
(Bilkent University, 2007)Silicon photonics opens opportunities to realize optoelectronic devices directly on large-scale integrated electronics, leveraging advanced Si fabrication and computation capabilities. However, silicon is constrained in ... -
Nuclear spin relaxation and spin squeezing under electric quadrupole interaction
(Bilkent University, 2015-08)Nuclear spins dynamics recently gained prominence for semiconductor quantum information technologies. At least two rami cations can be mentioned within this context: rst, as a decoherence channel for carrier spin qubit ... -
On the strain in silicon nanocrystals
(Bilkent University, 2009)In this Thesis we present our achievements towards an understanding of atomistic strain mechanisms and interface chemistry in silicon nanocrystals. The structural control of silicon nanocrystals embedded in amorphous ... -
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 ... -
Optical near field interaction of spherical quantum dots
(Bilkent University, 2012)Nanometer-sized materials can be used to make advanced photonic devices. However, as far as the conventional far-field light is concerned, the size of these photonic devices cannot be reduced beyond the diffraction limit ... -
Pairing in charged-neutral fermion mixtures under an artificial magnetic field
(Bilkent University, 2012)Bose-Einstein condensations (BEC), pairing behaviour, vortex formations in superconductivity and superfluidity are just a few examples of fascinating features of ultracold gases. In this thesis, we study charged-neutral ... -
Passivation of InSb infrared photodetectors
(Bilkent University, 2010)Infrared detectors have wide range applications in both military and civilian life. One of the most commonly used infrared detectors is InSb detectors. InSb detector technology has been developing since 1950s. Fabricating ... -
Persistent currents in carbon nanotubes
(Bilkent University, 2003)Carbon nanotubes are one of the most important findings of physics in the recent years. They are of great interest because of their various electrical, and mechanical features. All the properties of the nanotubes are ... -
Phase transitions in tetrahedral Ising lattices
(Bilkent University, 1993)After a review of the Renormalization CJroup theory, the phase diagram of unisotro])ic tetrahedral Ising lattice is explored l)y the motivation gained through the recent experimental findings about SiGe alloys. ... -
Phonon anomalies in high temperature superconductors
(Bilkent University, 1996)Anomalously large low temperature phonon anharmonicities can lead to static as well as dynamical changes in the low temperature properties of the vibrational system. In this work, we focus our attention on the low ... -
Phonon renormalization effects in low dimensional electron-hole systems
(Bilkent University, 1995)Ia)vv (linuMisioiial sciniromluclor st i iid iii4's lia\4‘ 1и‘(М1 an (‘Xt(Misiv(‘ i4\soa,rrh iwcix ill (4)iul(4iscd iiiatlcr physics. In j^aii iculai', iiindi (‘llorl has 1)(Ч'п dcvolnd to lhc‘ study ol ciuasi-one-diiiK'iisional ... -
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 ...
