Quantum oscillations in metallic Sb2Te2Se topological insulator

Shrestha, Keshav; Marinova, V.; Graf, D.; Lorenz, B.; Chu, C. W.

doi:10.1103/PhysRevB.95.075102

Quantum oscillations in metallic ${Sb}_{2} {Te}_{2} Se$ topological insulator

Journal Article · Wed Feb 01 00:00:00 EST 2017 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.95.075102· OSTI ID:1402500

Shrestha, Keshav ^[1]; Marinova, V. ^[2]; Graf, D. ^[3]; Lorenz, B. ^[4]; Chu, C. W. ^[5]

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)

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 Bi₂Se_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 Sb₂Te₂Se compound.

View Accepted Manuscript (DOE)

Research Organization:: Idaho National Laboratory, Idaho Falls, ID (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC)

Grant/Contract Number:: AC07-05ID14517; FG02-01ER45872

OSTI ID:: 1402500

Alternate ID(s):: OSTI ID: 1342443

Report Number(s):: INL/JOU--17-41200

Journal Information:: Physical Review B, Journal Name: Physical Review B Journal Issue: 7 Vol. 95; ISSN 2469-9950; ISSN PRBMDO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited By (2)

Propose two-dimensional Sb 2 Te 2 X (X = S, Se) with isotropic electron mobility and remarkable visible-light response Liang, Yan; Li, Jianwei; Jin, Hao Physical Chemistry Chemical Physics, Vol. 21, Issue 27 https://doi.org/10.1039/c9cp02098e	journal	January 2019
Evidence of a 2D Fermi surface due to surface states in a p -type metallic Bi ₂ Te ₃ Shrestha, K.; Marinova, V.; Lorenz, B. Journal of Physics: Condensed Matter, Vol. 30, Issue 18 https://doi.org/10.1088/1361-648x/aab6ca	journal	April 2018

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