Location of the minimum of the differential tunneling resistance $ \mathsf {R(V)}$ in a superconductor-degenerate semiconductor Schottky contact
| Autor: | M.P. Lissitski, M. Russo, Roberto Monaco, Ciro Nappi, V.N. Gubankov, Arturo Tagliacozzo, Adele Naddeo |
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| Rok vydání: | 2003 |
| Předmět: |
Physics
Condensed matter physics business.industry Schottky barrier Fermi energy Condensed Matter::Mesoscopic Systems and Quantum Hall Effect Condensed Matter Physics Metal–semiconductor junction Electronic Optical and Magnetic Materials Degenerate semiconductor Band bending Semiconductor Condensed Matter::Superconductivity Density of states Metal-induced gap states business |
| Zdroj: | The European physical journal. B, Condensed matter physics 32 (2003): 309–314. doi:10.1140/epjb/e2003-00103-x info:cnr-pdr/source/autori:Lissitski M.P., Naddeo A., Nappi C., Tagliacozzo A., Gubankov V.N., Monaco R., Russo M./titolo:Location of the minimum of the differential tunneling resistance R(V) in a superconductor-degenerate semiconductor Schottky contact/doi:10.1140%2Fepjb%2Fe2003-00103-x/rivista:The European physical journal. B, Condensed matter physics (Print)/anno:2003/pagina_da:309/pagina_a:314/intervallo_pagine:309–314/volume:32 |
| ISSN: | 1434-6036 1434-6028 |
| Popis: | Measurements of differential resistance in a superconductor-degenerate semiconductor junction Nb - n + + GaAs at T = 1.6 K show close similarity to those for a conventional superconductor-insulator- normal metal junction, except for the position of the minimum which is located at 3.6 meV. Using a simple model for the charge screening at the Schottky barrier, we give an argument why this minimum is by far displaced with respect to the superconducting gap energy ( Δ g = 1.5 meV for bulk Nb). We argue that a rebuilding of the density of states takes place at the barrier, due to the imperfect metal screening in the degenerate semiconductor. Energy states close to the degenerate semiconductor Fermi energy are depleted at the barrier and are not available for tunneling, up to an energy Eg which adds to the superconducting gap Δ g . |
| Databáze: | OpenAIRE |
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