Volume 114, Number 5, June 2016
|Number of page(s)||5|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||07 July 2016|
Anomalous superconducting proximity effect and coherent charge transport in semiconducting thin film with spin-orbit interaction
1 Lomonosov Moscow State University, Faculty of Physics - 1(2), Leninskie gory, GSP-1, 119991 Moscow, Russia
2 Lomonosov Moscow State University Skobeltsyn Institute of Nuclear Physics - 1(2), Leninskie gory, GSP-1, 119991 Moscow, Russia
3 Moscow Institute of Physics and Technology - 141700 Dolgoprudny, Moscow district, Russia
4 Moscow State Pedagogical University - 119992 Moscow, Russia
5 Institute of Solid State Physics RAS - 142432 Chernogolovka, Moscow district, Russia
Received: 11 March 2016
Accepted: 13 June 2016
We present a microscopic theory of the superconducting proximity effect in a semiconducting thin film with a spin-orbit interaction in an external magnetic field. We demonstrate that an effective 1D Hamiltonian which describes induced superconductivity in NSO in contact with a usual s-wave superconductor possesses not only a spin-singlet induced superconducting order parameter term, as commonly adopted, but also a spin triplet order parameter term. Using this new effective Hamiltonian we confirm previous results for a normal current across contacts of NSO with a normal metal and for a Josephson current with the same NSO with induced superconductivity, obtained previously in the framework of the phenomenological Hamiltonian without spin-triplet terms. However, a calculated current-phase relation across the transparent contact between NSO with induced superconductivity in magnetic field and a usual s-wave superconductor differs significantly from previous results. We suggest the experiment which can confirm our theoretical predictions.
PACS: 74.45.+c – Proximity effects; Andreev reflection; SN and SNS junctions / 74.50.+r – Tunneling phenomena; Josephson effects / 71.10.Pm – Fermions in reduced dimensions (anyons, composite fermions, Luttinger liquid, etc.)
© EPLA, 2016
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