Master Degree / Yüksek Lisans Tezleri
Permanent URI for this collectionhttps://hdl.handle.net/11147/3008
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Master Thesis Travel Time in Quantum Theory and Ionization Times of Noble Gases(01. Izmir Institute of Technology, 2020) Paçal, Serkan; Güçlü, Alev DevrimTime in Quantum mechanics, stands as an unresolved problem from the first time the theory was established to the present day. The present thesis consists of three main studies, in the first part, some time formulas that have been proposed in the past are included. In the second part, time is formulated by using David Bohm's "the guiding equation". In the third part, time formula has been applied to atomic potentials (He, Ar and Kr noble gases) for which time measurements done. It has been shown that the ionization time of the noble gases we have calculated gives results very compatible with the experiments.Master Thesis Two-Particle Schrodinger Operators With Point Interactions(01. Izmir Institute of Technology, 2020) Kızılkaya, Melih; Erman, FatihIn this thesis, a singular quantum mechanical problem, where two particles interact with each other through Dirac delta potentials in the plane, has been considered. The proof for the existence of a self-adjoint Hamiltonian operator for the model is given by using some operator theory techniques and renormalization idea in quantum field theory. Moreover, some necessary background for unbounded operators is reviewed in order to make the thesis as self-contained as possible.Master Thesis Quantum transport in nanostructured materials(Izmir Institute of Technology, 2017) Kurt, Gizem; Sevinçli, Haldun; Çakır, ÖzgürDue to the advances in the measurement and fabrication techniques at the nanoscale it is now possible to measure thermal transport across single molecule junctions[1], which makes it possible to consider nano-scale thermal devices. One of the building blocks for such thermal devices should be thermal switches. The aim of this study is to design a thermal switch, which is based on a single molecule junction and photoisomerism. We propose reversible photoisomerism as a key ingredient to build reversible thermal switches based on single molecule junctions. In this thesis, the thermal conductances of molecular junctions built by azobenzene and its derivatives are computed using density functional theory based tight binding method combined with atomistic Green’s functions. These molecules show photoisomeric behaviour by switching their three-dimensional structure when exposed to radiation. We investigate the effects of different linker groups as well as the details of the reservoirs. Carbon nanotubes are used as reservoirs, while generic reservoirs are also investigated to illuminate the effects of the reservoir details. We show that thermal conductance can be altered by switching the molecule from trans to cis configuration. The effect is robust under the change of the linkers that bind the molecules to the reservoirs and under the change of the particular molecular species.