Shot-noise and conductance measurements of transparent superconductor/two-dimensional electron gas junctions
| Autor: | S. Oberholzer, C. Hoffmann, Tatsushi Akazaki, Takis Kontos, Christian Schönenberger, Hideaki Takayanagi, A. E. Hansen, Wolfgang Belzig, Bong-Ryoul Choi |
|---|---|
| Rok vydání: | 2005 |
| Předmět: |
Materials science
Condensed Matter - Mesoscale and Nanoscale Physics Condensed matter physics business.industry pacs:72.70.+m Shot noise FOS: Physical sciences Conductance Heterojunction Condensed Matter Physics Noise (electronics) pacs:74.78.Na Electronic Optical and Magnetic Materials Andreev reflection law.invention pacs:74.45.+c pacs:73.23.-b Semiconductor law Ballistic conduction Mesoscale and Nanoscale Physics (cond-mat.mes-hall) ddc:530 business Beam splitter |
| Zdroj: | Physical Review B. 72 |
| ISSN: | 1550-235X 1098-0121 |
| DOI: | 10.1103/physrevb.72.024501 |
| Popis: | We have measured the conductance and shot-noise of superconductor-normal metal (S-N) junctions between a Niobium (Nb) film and a 2-dimensional electron gas (2DEG), formed in an InAs-based semiconductor heterostructure. Adjacent to the junction, the 2DEG is shaped into a submicrometer beam-splitter. The current shot-noise measured through one arm of the beam-splitter is found to be enhanced due to Andreev reflection. Both noise and conductance measurements indicate that the Nb-2DEG interface is of high quality with a transparency approaching approx. 60-70 %. The present device can be seen as a quasi-ballistic S-N beam-splitter junction. full paper including figures can be retrieved from: http://www.unibas.ch/phys-meso/Research/Papers/2004/Shot-Noise-Yjunction.pdf |
| Databáze: | OpenAIRE |
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