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Title: Quantum oscillations in metallic Sb 2 Te 2 Se topological insulator

Abstract

Here, we have studied the magnetotransport properties of the metallic, p-type Sb 2Te 2Se, which is a topological insulator. Magnetoresistance shows Shubnikov–de Haas oscillations in fields above B = 15 T. The maxima and minima positions of oscillations measured at different tilt angles with respect to the B direction align with the normal component of field Bcosθ, implying the existence of a two-dimensional Fermi surface in Sb 2Te 2Se. The value of the Berry phase β determined from a Landau level fan diagram is very close to 0.5, further suggesting that the oscillations result from topological surface states. From Lifshitz-Kosevich analyses, the position of the Fermi level is found to be F = 250 meV, above the Dirac point. This value of F is almost 3 times larger than that in our previous study on the Bi 2Se 2.1Te 0.9 topological insulator; however, it still touches the tip of the bulk valence band. This explains the metallic behavior and holelike bulk charge carriers in the Sb 2Te 2Se compound.

Authors:
 [1];  [2];  [3];  [4];  [5]
  1. Idaho National Lab. (INL), Idaho Falls, ID (United States)
  2. Bulgarian Academy of Sciences, Sofia (Bulgaria)
  3. Florida State Univ., Tallahassee, FL (United States)
  4. Univ. of Houston, Houston, TX (United States)
  5. Univ. of Houston, Houston, TX (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Publication Date:
Research Org.:
Idaho National Lab. (INL), Idaho Falls, ID (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1402500
Alternate Identifier(s):
OSTI ID: 1342443
Report Number(s):
INL/JOU-17-41200
Journal ID: ISSN 2469-9950; PRBMDO
Grant/Contract Number:  
AC07-05ID14517; FG02-01ER45872
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 95; Journal Issue: 7; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; surface states; topological insulator

Citation Formats

Shrestha, Keshav, Marinova, V., Graf, D., Lorenz, B., and Chu, C. W. Quantum oscillations in metallic Sb2Te2Se topological insulator. United States: N. p., 2017. Web. doi:10.1103/PhysRevB.95.075102.
Shrestha, Keshav, Marinova, V., Graf, D., Lorenz, B., & Chu, C. W. Quantum oscillations in metallic Sb2Te2Se topological insulator. United States. doi:10.1103/PhysRevB.95.075102.
Shrestha, Keshav, Marinova, V., Graf, D., Lorenz, B., and Chu, C. W. Wed . "Quantum oscillations in metallic Sb2Te2Se topological insulator". United States. doi:10.1103/PhysRevB.95.075102. https://www.osti.gov/servlets/purl/1402500.
@article{osti_1402500,
title = {Quantum oscillations in metallic Sb2Te2Se topological insulator},
author = {Shrestha, Keshav and Marinova, V. and Graf, D. and Lorenz, B. and Chu, C. W.},
abstractNote = {Here, we have studied the magnetotransport properties of the metallic, p-type Sb2Te2Se, which is a topological insulator. Magnetoresistance shows Shubnikov–de Haas oscillations in fields above B = 15 T. The maxima and minima positions of oscillations measured at different tilt angles with respect to the B direction align with the normal component of field Bcosθ, implying the existence of a two-dimensional Fermi surface in Sb2Te2Se. The value of the Berry phase β determined from a Landau level fan diagram is very close to 0.5, further suggesting that the oscillations result from topological surface states. From Lifshitz-Kosevich analyses, the position of the Fermi level is found to be F = 250 meV, above the Dirac point. This value of F is almost 3 times larger than that in our previous study on the Bi2Se2.1Te0.9 topological insulator; however, it still touches the tip of the bulk valence band. This explains the metallic behavior and holelike bulk charge carriers in the Sb2Te2Se compound.},
doi = {10.1103/PhysRevB.95.075102},
journal = {Physical Review B},
number = 7,
volume = 95,
place = {United States},
year = {2017},
month = {2}
}

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Cited by: 7 works
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Works referenced in this record:

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Quantum oscillations of the topological surface states in low carrier concentration crystals of <mml:math altimg="si0019.gif" overflow="scroll" xmlns:xocs="http://www.elsevier.com/xml/xocs/dtd" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.elsevier.com/xml/ja/dtd" xmlns:ja="http://www.elsevier.com/xml/ja/dtd" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:tb="http://www.elsevier.com/xml/common/table/dtd" xmlns:sb="http://www.elsevier.com/xml/common/struct-bib/dtd" xmlns:ce="http://www.elsevier.com/xml/common/dtd" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:cals="http://www.elsevier.com/xml/common/cals/dtd" xmlns:sa="http://www.elsevier.com/xml/common/struct-aff/dtd"><mml:msub><mml:mrow><mml:mi>Bi</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mrow><mml:mi>Sb</mml:mi></mml:mrow><mml:mrow><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mrow><mml:mi>Te</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn><mml:mo>−</mml:mo><mml:mi>y</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mrow><mml:mi>Se</mml:mi></mml:mrow><mml:mrow><mml:mi>y</mml:mi></mml:mrow></mml:msub></mml:math>
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    Works referencing / citing this record:

    Propose two-dimensional Sb 2 Te 2 X (X = S, Se) with isotropic electron mobility and remarkable visible-light response
    journal, January 2019

    • Liang, Yan; Li, Jianwei; Jin, Hao
    • Physical Chemistry Chemical Physics, Vol. 21, Issue 27
    • DOI: 10.1039/c9cp02098e

    Propose two-dimensional Sb 2 Te 2 X (X = S, Se) with isotropic electron mobility and remarkable visible-light response
    journal, January 2019

    • Liang, Yan; Li, Jianwei; Jin, Hao
    • Physical Chemistry Chemical Physics, Vol. 21, Issue 27
    • DOI: 10.1039/c9cp02098e