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

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

Journal Article · Wed Apr 27 00:00:00 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.

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

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

Grant/Contract Number:: SC00112704

OSTI ID:: 1336146

Report Number(s):: BNL-112626-2016-JA; R&D Project: PM016; KC0201050

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

Publisher:: World ScientificCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 4 works

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topological insulator
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Title: Point-contact Andreev reflection spectroscopy on Bi ₂ Se ₃ single crystals