Quantum oscillations in metallic ${\mathrm{Sb}}_{2}{\mathrm{Te}}_{2}\mathrm{Se}$ topological insulator
Abstract
Here, we have studied the magnetotransport properties of the metallic, ptype Sb _{2}Te _{2}Se, 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 twodimensional Fermi surface in Sb _{2}Te _{2}Se. 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 LifshitzKosevich 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 _{2}Se _{2.1}Te _{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 _{2}Te _{2}Se 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/JOU1741200
Journal ID: ISSN 24699950; PRBMDO
 Grant/Contract Number:
 AC0705ID14517; FG0201ER45872
 Resource Type:
 Accepted Manuscript
 Journal Name:
 Physical Review B
 Additional Journal Information:
 Journal Volume: 95; Journal Issue: 7; Journal ID: ISSN 24699950
 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, ptype 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 twodimensional 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 LifshitzKosevich 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}
}
Web of Science
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Works referencing / citing this record:
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