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 36 for “"One-dimensional systems"”.
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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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Strong correlations and topological order in one-dimensional systems
… theoretical studies of strongly correlated systems as well as topologically ordered systems in 1D. Non-Fermi liquid behavior characteristic of interacting 1D electron systems is investigated with an emphasis on experimentally relevant setups and observables. The existence of end Majorana …
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Localization and low temperature transport in disordered one-dimensional systems
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Physics, 1983.
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Tunable spin polarization and conductance anomalies in mesoscopic one-dimensional systems
The electronic transport properties of mesoscopic one-dimensional (1D) devices have attracted significant interest because of their potential applications and their unique characteristics, some of which – for instance, the “0.7” conductance anomaly in quantum point contacts – have remained …
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Fluctuation conductivity from charge density waves in pseudo-one-dimensional systems
… to enhanced electrical conductivity in pseudo-one-dimensional systems. The experimental facts concerning pseudo-one-dimensional systems which may illustrate aspects of the Fröhlich mechanism are reviewed. The physical basis of the Fröhlich model is discussed in detail and is extended by the new …
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Novel Aspects of Localization, Delocalization, and Anomalous Transport in One-dimensional Systems
… in some newly discovered or not fully explored one-dimensional (1D) systems that are related to the current research frontiers, e.g., graphene and topological insulators. Specifically, we firstly study 1D disordered graphene superlattices, and show that both localization and delocalization can …
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Ab initio all-electron full-potential linearized augmented plane-wave method for one-dimensional systems
… allowing the fabrication of a rich variety of one-dimensional (1D) structures.They include single walled (SWNT) and multi-walled (MWNT) one-dimensional tubular structures, made of carbon, GaN, BN, TiO, VO and other compounds, thin metallic quantum wires, quasi-1D molecular magnets etc, and show …
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Monte Carlo simulation of quasi-one-dimensional semiconductors
… of the particular confinement configuration of one-dimensional systems, the absence of angular randomization during scattering makes the carrier distribution sensitive to external perturbations and causes appreciable deviations from the equilibrium relatively rapidly. A Monte Carlo simulation is …
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Bosonization and the many-body problem
… method of bosonization of fermionic many-body systems in any number of dimensions is developed. After an introduction to the problem in chapter 1 and to the method of bosonization in chapter 2 (with its application to the non-interacting problem) the Fermi liquid behavior of interacting …
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Maps of intervals with indifferent fixed points: thermodynamic formalism and phase transitions
… interval with indifferent fixed points. For such systems the formalism yields one-dimensional systems with many-body infinite range interactions for which the thermodynamics is well defined while the Gibbs states are not. (Piecewise linear systems of this kind yield the soluble, in a sense, Fisher …
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Wachstum und Charakterisierung von Halbleiternanostrukturen auf vorstrukturiertem Substrat
… and experimental interest in the physics of low-dimensional electron systems which are predicted to exhibit unique electronic and optical properties. The reduced phase space available for electron scattering in one-dimensional systems – so called quantum wires – is expected to lead to a greatly …
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Anderson Localization in Low-Dimensional Systems with Long-Range Correlated Disorder
… phenomenological representation of many physical systems. To date, a large amount of effort has been dedicated to the study of uncorrelated, or short-range correlated, disorder distributions. However, more recent efforts on long-range correlated disorder distributions have yielded richer results, …
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Non-Hermitian topological states in photonic systems
… the search for topological states in photonic systems with the hope of describing new mechanisms for controlling and increasing the number of physical systems in which robust light transport can be achieved. In coupled resonator optical waveguides, I demonstrate the formation of topological …
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Electronic structure of strongly correlated low-dimensional spin ½ systems: cuprates and vanadates
… and antimony vanadates appeared to be spin-½ one-dimensional systems, the latter having much stronger one-dimensional character and being probably the best realization of inorganic spin-Peierls system. The molybdenum vanadate was found to be two-dimensional spin-½ system. The Mo 4d orbitals …
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Semiconductor nanodevices as a probe of strong electron correlations
An electron is usually considered to have only one type of kinetic energy, but could it have more, for both its spin and charge, or by exciting other electrons? In one dimension (1D), the physics of interacting electrons is captured well at low energies by the linear Tomonaga- Luttinger Liquid …
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Entanglement entropy in quantum many particle systems and their simulation via ansatz states
In contrast to classical many-particle systems for which the number of degrees of freedom grows linearly with the system size, it grows exponentially for quantum many-particle systems. On the one hand, the resulting complexity of the quantum systems has a high potential for technological advances …
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Energy and information transfer via coherent exciton wave packets
… investigation to design condensed matter systems which support the requisite coherent transport. Under the idealizing assumption that exciton-phonon entanglement could be completely suppressed, the majority of this thesis focuses on the creation and manipulation of exciton wave packets in …
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Dynamical correlations of S=1/2 quantum spin chains
… of interactions and quantum fluctuations in one-dimensional systems. The XXZ model has been used to study the unusual properties of anisotropic spin chains in an external magnetic field. The zero temperature phase diagram for this model exhibits a critical or quasi-long-range-ordered phase …
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Delocalization phenomena in strongly disordered systems
… delocalization mechanisms in strongly disordered systems. We focus on one-dimensional systems where the localizing effects of disorder are strongest. Our explorations of delocalization mechanisms will reveal new insights into the nature of Anderson transitions in the context of the entanglement, …
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Simulation of Thermal Effects in Semiconductor Materials and Devices
… transport are developed and utilized. For one-dimensional systems like carbon nanotubes, the equations for transport and potentials are discretized in space, momentum, and time, and solved by an explicit upwind method. For the simulation of devices like MOSFETs, the full-band Monte Carlo …
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