Electronic conduction in linear quantum systems: Coherent transport and the effects of decoherence

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Coherent quantum transport in linear and quasi-linear tight-binding models and the influence of decoherence are studied. For the coherent transport description, Green functions and surface Green functions of semi-infinite systems are calculated and the transmission through defects and finite tight-binding chains with and without diagonal disorder are examined. A statistical model based on the division of a large system into coherent subsystems and decoherence regions is analyzed. While on the total system level, classical rate equations interrelate electron energy distribution functions assigned to the decoherence regions, the transition rates themselves are calculated using quantum transport formalism. Thus a two-scale approach is used. For contact Fermi energies within the tight-binding band of the system without disorder, ohmic large scale behavior is observed for any finite density of decoherence regions. If the Fermi energy is outside the band, and for disordered systems, critical decoherence densities are defined. Above the critical densities, material-specific resistivities can be defined. Applying the statistical model for the effects of decoherence on DNA double strands, experimental findings for base-sequence dependent conductance are reproduced.
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Dokumententyp:
Wissenschaftliche Abschlussarbeiten » Dissertation
Fakultät / Institut:
Fakultät für Physik » Theoretische Physik
Dewey Dezimal-Klassifikation:
500 Naturwissenschaften und Mathematik » 530 Physik
Physics and Astronomy Classification Scheme:
70. Condensed matter: electronic structure, electrical, magnetic, and optical properties » 72. Electronic transport in condensed matter
00. General » 05. Statistical physics and thermodynamics » 05.60.+w Transport processes: theory
70. Condensed matter: electronic structure, electrical, magnetic, and optical properties » 72. Electronic transport in condensed matter » 72.10.-d Theory of electronic transport; scattering mechanisms » 72.10.Bg General formulation of transport theory
70. Condensed matter: electronic structure, electrical, magnetic, and optical properties » 73. Electronic structure and electrical properties of surfaces, interfaces, and thin films » 73.23.-b Mesoscopic systems
Stichwörter:
Quantentransport, Dekohärenz
Beitragende:
Prof. Dr. rer. nat. Wolf, Dietrich E. [Betreuer(in), Doktorvater]
Prof. Dr. Cuevas, Juan Carlos [Gutachter(in), Rezensent(in)]
Sprache:
Englisch
Kollektion / Status:
Dissertationen / Dokument veröffentlicht
Datum der Promotion:
16.04.2010
Dokument erstellt am:
22.04.2010
Promotionsantrag am:
26.02.2010
Dateien geändert am:
22.04.2010
Medientyp:
Text