Point-contact Andreev reflection spectroscopy on Bi 2 Se 3 single crystals

Granstrom, C. R.; Fridman, I.; Lei, H. -C.; Petrovic, C.; Wei, J. Y.  T.

doi:10.1142/S0217979216420029

Point-contact Andreev reflection spectroscopy on Bi ₂ Se ₃ single crystals

Journal Article · Wed Apr 27 04:00:00 EDT 2016 · International Journal of Modern Physics B

DOI:https://doi.org/10.1142/S0217979216420029· OSTI ID:1336146

Granstrom, C. R. ^[1]; Fridman, I. ^[1]; Lei, H. -C. ^[2]; Petrovic, C. ^[2]; Wei, J. Y. T. ^[3]

Univ. of Toronto, ON (Canada). Dept. of Physics
Brookhaven National Lab. (BNL), Upton, NY (United States). Condensed Matter Physics and Materials Science Dept.
Univ. of Toronto, ON (Canada). Dept. of Physics; Canadian Inst. for Advanced Research, Toronto ON (Canada)

In order to study how Andreev reflection (AR) occurs between a superconductor and a three-dimensional topological insulator (TI), we use superconducting Nb tips to perform point-contact AR spectroscopy at 4.2 K on as-grown single crystals of Bi₂Se₃. Scanning tunneling spectroscopy and scanning tunneling microscopy are also used to characterize the superconducting tip and both the doping level and surface condition of the TI sample. Furthermore, the point-contact measurements show clear spectral signatures of AR, as well as a depression of zero-bias conductance with decreasing junction impedance. The latter observation can be attributed to interfacial Rashba spin-orbit coupling, and the presence of bulk bands at the Fermi level in our samples suggests that bulk states of Bi2Se3 are involved in the observed AR.

View Accepted Manuscript (DOE)

Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

OSTI ID:: 1336146

Report Number(s):: BNL--112626-2016-JA; KC0201050

Journal Information:: International Journal of Modern Physics B, Journal Name: International Journal of Modern Physics B Journal Issue: 13 Vol. 30; ISSN 0217-9792

Publisher:: World ScientificCopyright Statement

Country of Publication:: United States

Language:: English

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Cited By (1)

Suppression of transport spin-polarization of surface states with emergence of ferromagnetism in Mn-doped Bi ₂ Se ₃ Kamboj, Suman; Das, Shekhar; Sirohi, Anshu Journal of Physics: Condensed Matter, Vol. 30, Issue 35 https://doi.org/10.1088/1361-648x/aad3ed	journal	August 2018

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75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
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superconductor
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