Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 22 for “"mesoscopic systems"”.
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Quantum behavior in mesoscopic systems
… parts; in the first one I present the study of mesoscopic quantum systems whereas in the second one I address the problem of the definition of Markov regime for quantum system dynamics. The first work presented is the study of vortex patterns in (quasi) two dimensional rotating Bose Einstein …
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Electric current fluctuations in mesoscopic systems
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 1996.
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Thermoelectric properties of mesoscopic systems in GaAs
… describes the thermoelectric properties of mesoscopic structures in modulation doped GaAs/ Al0.33Ga0.67As heterostructures. In particular, we study the thermopower of two-dimensional mesoscopic systems (2DMSs) and antidot lattices defined in them. Quantum oscillations in the thermopower (TP) …
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Computational and Experimental Studies of Coherence and Energy Flow in Microscopic and Mesoscopic Systems
… surfaces is another process in which an open systems approach is appropriate. Therefore, we adopt a master equation model previously applied to this problem, and propose resonant IR overtone excitation of the surface Si-H vibration as a method for enhancing desorption rates. Finally, we …
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Quantum transport in mesoscopic systems of Bi and other strongly spin-orbit coupled materials
Systems with strong spin-orbit coupling are of particular interest in solid state physics as an avenue for observing and manipulating spin physics using standard electrical techniques. This dissertation focuses on the characteristics of elemental bismuth (Bi), which exhibits some of the strongest …
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Design, fabrication, and characterization of low-dimensional quantum devices
… phenomena have been observed in these mesoscopic systems. This thesis describes the design principle, fabrication technique, and transport characterization of various low-dimensional quantum devices.
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HYDRODYNAMIC AND BALLISTIC TRANSPORT IN ULTRA-CLEAN 2D ELECTRON SYSTEMS
This work is broadly on hydrodynamic transport in mesoscopic systems, resulting from strong electron-electron interactions. In the first part, we consider electrons are in near thermal equilibrium with each other, and for which case we calculate conductance by solving hydrodynamic equations. We do …
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Application of RMT-RNN improved decomposition onto defected system
… with Neural Networks (RMT-RNN) to large static systems with relatively large disorder in mesoscopic systems. It is a new algorithm that can quickly decompose random matrices with real eigenvalues for further study of physical properties, such as transmission probability, conductivity and so on. …
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A method for detecting nonequilibrium dynamics in active matter
… to measure the breaking of detailed balance in mesoscopic systems.
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Quantum transport of electrons through graphene and carbon nanotubes
… of nano-technology. Quantum transport through mesoscopic systems explains a wide range of interesting experimental findings, such as: rectification, switching mechanism and transistor actions. We focused our research on the quantum transmission of electrons through graphene and carbon …
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Studies on the effect of noise in boundary quantum phase transitions
… deeper knowledge of strongly correlated electron systems that is beyond the widely applied mean field treatment.</p><p>Meanwhile, with strong boundary effect, most systems with boundary quantum phase transition can generally be considered as effectively zero-dimensional, with reservoir details …
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Experimental Observation of Geometric Phases in Narrow-Gap Semiconductor Heterostructures
… phase by fabricating low dimensional (d ≤ 2) mesoscopic interferometers in high-quality narrow-gap semiconductor (NGS) heterostructures. The low effective-mass electrons in NGS heterostructures enable observation of delicate quantum phases; and the strong spin-orbit interaction (SOI) in the …
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EXPLORING THE INFLUENCE OF SIZE DISPERSITY ON MESOSCALE SELF-ASSEMBLY OF BIDISPERSE SYSTEM VIA MOLECULAR DYNAMICS
… layer of complexity to the assembly behavior of mesoscopic sys- tems. This complexity can inhibit the straightforward implementation of materials design and significantly influences both the crystallization process and the stability of the resultant structure. In-depth comprehension of these …
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The effects of disorder on superconducting islands and island arrays
Characterizing the role of disorder in 2D and mesoscopic superconducting materials has proven pivotal in the understanding of quantum phase transitions. In the presence of Anderson localization, electronic wavefunctions are known to become localized leading to strongly correlated phases of matter …
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Theoretical and numerical study of nanostructures
… techniques have been used in the study of mesoscopic systems with complex geometry including transmission matrix methods, mode matching, and tight binding Green's function techniques such as the one used by Sols et al. in the study of the quantum modulated transistor. NPDX, however, permits …
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Theoretical and numerical study of nanostructures
… techniques have been used in the study of mesoscopic systems with complex geometry including transmission matrix methods, mode matching, and tight binding Green's function techniques such as the one used by Sols et al. in the study of the quantum modulated transistor. NPDX, however, permits …
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Acoustoelectric charge transport in quasi-one-dimensional systems
The study of electron transport in mesoscopic systems has recently turned to the observation of time dependent single electron e ects, where the electron transport is frequency locked to an external potential. Such devices are expected to form the basis of a standard of electric current, long …
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Mesoscopic quantum interference experiments in InGaAs and GaAs two-dimensional systems
The study of quantum interference in solid-state systems yields insight in fundamental properties of mesoscopic systems. Electron quantum interference constitutes an important method to explore mesoscopic physics and quantum decoherence. This dissertation focuses on two-dimensional (2D) electron …
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Quantum-coherent transport in low-dimensional mesoscopic structures and thin films
… interference phenomena and quantum coherence in mesoscopic systems, and quantum transport as well as magnetotransport in various materials system. One overarching aim is exploring the different mechanisms that give rise to quantum phase decoherence in lithographically patterned mesoscopic …
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A combined experimental and theoretical approach towards the understanding of transport in one-dimensional molecular nanostructures
… temperatures. The electronic properties of these systems are theoretically studied using Monte Carlo simulations and environment dependent tight-binding calculations. From our results, we address the possibility of double-slit like interference processes of counter-propagating electron waves in …
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