Fluctuating and Phase -Stiff Proximity-Induced Superconductivity in Superconductor-Semiconductor Junctions
Flexner, Soren Daniel
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https://hdl.handle.net/2142/80530
Description
Title
Fluctuating and Phase -Stiff Proximity-Induced Superconductivity in Superconductor-Semiconductor Junctions
Author(s)
Flexner, Soren Daniel
Issue Date
2006
Doctoral Committee Chair(s)
Eckstein, James N.
Department of Study
Physics
Discipline
Physics
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Physics, Condensed Matter
Language
eng
Abstract
Results from transport measurements made on Nb/InGaAs heterojunctions show evidence of strong coupling across the superconductor-semiconductor interface. A novel 3-Terminal device geometry allows the simultaneous extraction of the specific contact conductance and the 2D sheet resistance in the semiconductor nearby the junction interface. A transition from fluctuating to phase-stiff proximity induced superconductivity is observed in the semiconductor at temperatures often well below the transition temperature of the superconductor. This phenomenological interpretation is supported by the fact that the enhancement observed in the specific contact conductance is too large (greater than a factor of two) to be explained by simple Andreev reflection. Significant and abrupt changes in the semiconductor's 2D sheet resistance also suggest phenomenology beyond simple boundary effects.
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