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

Abstract

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.

Authors:
 [1];  [1];  [2];  [2];  [3]
  1. Univ. of Toronto, ON (Canada). Dept. of Physics
  2. Brookhaven National Lab. (BNL), Upton, NY (United States). Condensed Matter Physics and Materials Science Dept.
  3. Univ. of Toronto, ON (Canada). Dept. of Physics; Canadian Inst. for Advanced Research, Toronto ON (Canada)
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1336146
Report Number(s):
BNL-112626-2016-JA
Journal ID: ISSN 0217-9792; R&D Project: PM016; KC0201050
Grant/Contract Number:  
SC00112704
Resource Type:
Accepted Manuscript
Journal Name:
International Journal of Modern Physics B
Additional Journal Information:
Journal Volume: 30; Journal Issue: 13; Journal ID: ISSN 0217-9792
Publisher:
World Scientific
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Andreev reflection; topological insulator; superconductor

Citation Formats

Granstrom, C. R., Fridman, I., Lei, H. -C., Petrovic, C., and Wei, J. Y. T. Point-contact Andreev reflection spectroscopy on Bi 2 Se 3 single crystals. United States: N. p., 2016. Web. doi:10.1142/S0217979216420029.
Granstrom, C. R., Fridman, I., Lei, H. -C., Petrovic, C., & Wei, J. Y. T. Point-contact Andreev reflection spectroscopy on Bi 2 Se 3 single crystals. United States. doi:10.1142/S0217979216420029.
Granstrom, C. R., Fridman, I., Lei, H. -C., Petrovic, C., and Wei, J. Y. T. Wed . "Point-contact Andreev reflection spectroscopy on Bi 2 Se 3 single crystals". United States. doi:10.1142/S0217979216420029. https://www.osti.gov/servlets/purl/1336146.
@article{osti_1336146,
title = {Point-contact Andreev reflection spectroscopy on Bi 2 Se 3 single crystals},
author = {Granstrom, C. R. and Fridman, I. and Lei, H. -C. and Petrovic, C. and Wei, J. Y. T.},
abstractNote = {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.},
doi = {10.1142/S0217979216420029},
journal = {International Journal of Modern Physics B},
number = 13,
volume = 30,
place = {United States},
year = {2016},
month = {4}
}

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    Works referencing / citing this record:

    Growth and characterization of Bi 2 Se 3 crystals by chemical vapor transport
    journal, June 2012

    • Jiao, W. H.; Jiang, S.; Feng, C. M.
    • AIP Advances, Vol. 2, Issue 2
    • DOI: 10.1063/1.4727957

    Probing multiband superconductivity by point-contact spectroscopy
    journal, March 2010


    Directional point-contact Andreev-reflection spectroscopy of Fe-based superconductors: Fermi surface topology, gap symmetry, and electron–boson interaction
    journal, November 2011


    Coexistence of the topological state and a two-dimensional electron gas on the surface of Bi2Se3
    journal, November 2010

    • Bianchi, Marco; Guan, Dandan; Bao, Shining
    • Nature Communications, Vol. 1, Issue 1
    • DOI: 10.1038/ncomms1131

    Point-contact Andreev-reflection spectroscopy in anisotropic superconductors: The importance of directionality (Review Article)
    journal, March 2013

    • Daghero, D.; Tortello, M.; Pecchio, P.
    • Low Temperature Physics, Vol. 39, Issue 3
    • DOI: 10.1063/1.4794994

    Helical States of Topological Insulator Bi 2 Se 3
    journal, May 2011

    • Zhao, Yonghong; Hu, Yibin; Liu, Lei
    • Nano Letters, Vol. 11, Issue 5
    • DOI: 10.1021/nl200584f

    Andreev reflection at the edge of a two-dimensional electron system with strong spin-orbit coupling
    journal, December 2013


    Tunneling into d -wave superconductors: Effects of interface spin-orbit coupling
    journal, November 2010


    Observation of a large-gap topological-insulator class with a single Dirac cone on the surface
    journal, May 2009

    • Xia, Y.; Qian, D.; Hsieh, D.
    • Nature Physics, Vol. 5, Issue 6, p. 398-402
    • DOI: 10.1038/nphys1274

    Charge transport in two-dimensional electron gas/insulator/superconductor junctions with Rashba spin-orbit coupling
    journal, July 2006


    Proximity Effect From an Andreev Perspective
    journal, October 2004


    Measuring the Spin Polarization of a Metal with a Superconducting Point Contact
    journal, October 1998