Simultaneous detection of quantum oscillations from bulk and topological surface states in metallic Bi₂Se_2.1Te_0.9

Journal Article · 12 April 2017 · Philosophical Magazine (2003, Print)

DOI: https://doi.org/10.1080/14786435.2017.1314563 · OSTI ID:1402502

Shrestha, Keshav ^[1]; Graf, David E. ^[2]; Marinova, Vera ^[3]; Lorenz, Bernd ^[4]; Chu, Paul C. W. ^[5]

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1. Idaho National Lab. (INL), Idaho Falls, ID (United States)
2. Florida State Univ., Tallahassee, FL (United States). National High Magnetic Field Lab. (MagLab)
3. Bulgarian Academy of Sciences, Sofia (Bulgaria). Inst. of Optical Materials and Technology
4. Univ. of Houston, Houston, TX (United States). Texas Center for Superconductivity (TCSUH) and Dept. of Physics
5. Univ. of Houston, Houston, TX (United States). Texas Center for Superconductivity (TCSUH) and Dept. of Physics; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

Here, Shubnikov-de Haas (SdH) oscillations in metallic Bi₂Se_2.1Te_0.9 are studied in magnetic fields up to 35 Tesla. It is demonstrated that two characteristic frequencies determine the quantum oscillations of the conductivity. Angle dependent measurements and calculations of the Berry phase show that the two frequencies F₁ and F₂ describe oscillations from surface and bulk carriers, respectively. At low magnetic fields, only SdH oscillation from topological surface states can be detected whereas at high magnetic field the bulk oscillations dominate. The origin of the separation of bulk and surface SdH oscillations into different magnetic field ranges is revealed in the difference of the cyclotron masses m_c. The bulk m_c is nearly three times larger than the surface cyclotron mass resulting in a stronger attenuation of the bulk oscillation amplitude upon decreasing magnetic field. This makes it possible to detect and characterize the surface SdH oscillations in the low-field range and the bulk oscillations at high magnetic fields.

• Research Organization: Idaho National Laboratory, Idaho Falls, ID (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
• Sponsoring Organization: USDOE Office of Nuclear Energy (NE); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; T.L.L. Temple Foundation; John J. and Rebecca Moores Endowment; US Air Force Office of Scientific Research (AFOSR); Bulgaria National Science Fund (BNSF); National Science Foundation (NSF)
• Grant/Contract Number: AC07-05ID14517; FG02-01ER45872
• OSTI ID: 1402502
• Report Number(s): INL/JOU--17-41576
• Journal Information: Philosophical Magazine (2003, Print), Journal Name: Philosophical Magazine (2003, Print) Journal Issue: 20 Vol. 97; ISSN 1478-6435
• Publisher: Taylor & FrancisCopyright Statement
• Country of Publication: United States
• Language: English