Quantum oscillations in metallic 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:
-
- Idaho National Lab. (INL), Idaho Falls, ID (United States)
- Bulgarian Academy of Sciences, Sofia (Bulgaria)
- Florida State Univ., Tallahassee, FL (United States)
- Univ. of Houston, Houston, TX (United States)
- 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:
- Journal Article: 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. https://doi.org/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. https://doi.org/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},
url = {https://www.osti.gov/biblio/1402500},
journal = {Physical Review B},
issn = {2469-9950},
number = 7,
volume = 95,
place = {United States},
year = {2017},
month = {2}
}
Web of Science
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Works referencing / citing this record:
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