Optoelectronic transport in topologically protected quantum systems

Kastl, Christoph

Professur für Experimentalphysik (E24) - Nanotechnologie und -materialien (NIM-Cluster) (Prof. Holleitner)

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Original title:: Optoelectronic transport in topologically protected quantum systems
Translated title:: Optoelektronischer Transport in topologisch geschützten Quantensystemen
Author:: Kastl, Christoph
Year:: 2015
Document type:: Dissertation
Faculty/School:: Fakultät für Physik
Advisor:: Holleitner, Alexander (Prof. Dr.)
Referee:: Holleitner, Alexander (Prof. Dr.); Pfleiderer, Christian (Prof., Ph.D.); Burkard, Guido (Prof., Ph.D.)
Language:: en
Subject group:: PHY Physik
Keywords:: Topological Insulators, Optoelectronic, Quantum Hall
Translated keywords:: Topologische Isolatoren, Optoelektronik, Quanten Hall
TUM classification:: TEC 030d; PHY 685d; ELT 300d
Abstract:: In this thesis, the optoelectronic transport at the surface of three-dimensional topological insulators is investigated by photocurrent microscopy. Employing time-resolved photocurrent spectroscopy, we show that surface currents in the topological insulator Bi₂Se₃ can be controlled by circularly polarized light on a picosecond timescale at room temperature. Furthermore, we study the influence of intrinsic local potential fluctuations on the optoelectronic transport in Bi₂Se₃ and BiSbTe₃ films grown by molecular beam epitaxy. «
In this thesis, the optoelectronic transport at the surface of three-dimensional topological insulators is investigated by photocurrent microscopy. Employing time-resolved photocurrent spectroscopy, we show that surface currents in the topological insulator Bi₂Se₃ can be controlled by circularly polarized light on a picosecond timescale at room temperature. Furthermore, we study the influence of intrinsic local potential fluctuations on the optoelectronic transport in Bi₂Se₃ and BiSbTe₃ films gr... »
Translated abstract:: In der vorliegenden Dissertation wird mittels Photostrommikrosopie der optoelektronische Transport an der Oberfläche von dreidimensionalen topologischen Isolatoren untersucht. Mit Hilfe von zeitaufgelöster Photostromspektroskopie wird bei Raumtemperatur gezeigt, dass zirkular polarisiertes Licht Oberflächenströme im topologischen Isolator Bi₂Se₃ auf einer Pikosekundenskala kontrolliert. Darüber hinaus wird der Einfluss von intrinsischen, lokalen Potentialfluktuationen auf den optoelektronischen Transport in epitaktischen Bi₂Se₃ und BiSbTe₃ Schichten untersucht.
Series:: Selected topics of semiconductor physics and technology
Series volume:: 193
ISBN:: 978-3-941650-93-0
WWW:: https://mediatum.ub.tum.de/?id=1273679
Date of submission:: 28.07.2015
Oral examination:: 28.10.2015
Last change:: 29.01.2016
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