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

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:
Report Number(s):
INL/JOU-17-41200
Journal ID: ISSN 2469-9950; PRBMDO
Grant/Contract Number:
AC07-05ID14517; DOE FG02-01ER45872
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)
Research Org:
Idaho National Lab. (INL), Idaho Falls, ID (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; surface states; topological insulator
OSTI Identifier:
1402500
Alternate Identifier(s):
OSTI ID: 1342443