Advisors
Now showing items 1-20 of 26
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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 ... -
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 ... -
Dynamics of sliding and loading bilayer graphene
(Bilkent University, 2022-09)Sliding and loading bilayer graphene is investigated using the Tight Binding method. We develop interaction-distance dependent tight binding parameter functions to allow for the calculation of band structure for different ... -
Electronic structure of graphene nano-ribbons
(Bilkent University, 2008)Graphite is a known material to human kind for centuries as the lead of a pencil. Graphene as a two dimensional material, is the single layer of graphite. Many theoretical works have been done about it so far, however, ... -
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 ... -
First-principles investigation of functionalization of graphene
(Bilkent University, 2013)The graphene sheet is a single-atom thick novel material and attracts great interest due to its unique features. However, it is a metallic material with no bandgap, which makes it difficult to integrate in electronic ... -
First-principles investigation of graphitic nanostructures
(Bilkent University, 2013)In this thesis, first-principles investigations of several graphene related nanosystems based on density functional theory are presented. First, the electronic structure of several graphene nano-ribbons both in 1D and ... -
Frictional properties of quasi-two-dimensional materials from the Prandtl-Tomlinson model
(Bilkent University, 2016-09)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 ... -
Haldane phase in the bond-alternating spin-1/2 XXZ chain: DMRG and fermionization studies
(Bilkent University, 2018-12)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 ... -
High pressure properties of metals from first principle calculations : gold as an example
(Bilkent University, 2004) -
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 ... -
Investigation of optical residual absorption in graphene
(Bilkent University, 2018-02)Graphene, a 2-dimensional 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 ... -
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 ... -
Janus particles in a Gaussian optical potential: a comparative experimental study
(Bilkent University, 2020-07)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 ... -
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 ... -
Many-body theory explored optical properties of selected 2D group II-VI monochalcogenides
(Bilkent University, 2022-09)Two-dimensional (2D) metal oxides (MOs) and metal chalcogenides (MChs) are emerging classes of 2D materials. Depending on the constituent elements, these materials can display various electronic and optical properties ... -
Mechanical and electronic properties of metal chain nanowires
(Bilkent University, 2003)The fabrication of stable gold monoatomic chains suspended between two gold electrodes is one of the milestones in nanoscience and technology, since miniaturization of the electronic components is one of the great ... -
Model description of friction on planar and buckled two dimensional materials
(Bilkent University, 2018-01)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 ... -
Modeling of semiconductor devices based on quantum wells: quantum cascade laser as an example
(Bilkent University, 2018-02)It has been two decades since the quantum-cascade 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 ... -
Novel concepts in high power semiconductor lasers
(Bilkent University, 2018-11)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 ...
