Optical spectroscopy and Fermi Surface studies of the Rashba spin-splitting compound BiTeI

ORAL

Abstract

We measured the temperature dependent optical reflectivity $R(\omega$) and Shubnikov-de Haas oscillations in samples of BiTeI with different carrier concentrations. The electronic excitation spectrum, although consistent with Rashba spin-splitting of the bulk electronic bands, reveals additional features: a low energy excitation band and a larger number of phonons than expected from crystal structure. Some of the vibrational modes have strongly asymmetric line-shape. The period of quantum oscillations scales remarkably well with the component of magnetic field along the crystallographic $c$-axis and is rapidly suppressed when the field is tilted from this axis. We discuss our results in connection with possible charge accumulation at the surface of BiTeI.

*Work at UF supported by the US DOE through contract DE-FG02-02ER45984

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Authors

  • Catalin Martin

    • University of Florida, Gainesville, Florida, 32611, USA

  • K.H. Miller

    • University of Florida, Gainesville, Florida, 32611, USA

  • S. Buvaev

    • University of Florida, Gainesville, Florida, 32611, USA

  • A.F. Hebard

    • University of Florida, Gainesville, Florida, 32611, USA

  • E.D. Mun

    • National High Magnetic Field Laboratory, Los Alamos, NM, 87545, USA

  • V. Zapf

    • National High Magnetic Field Laboratory, Los Alamos, NM, 87545, USA

  • H. Berger

    • Ecole Polytechnique Federal de Lausanne, CH-1015 Lausanne, Switzerland

  • D.B. Tanner

    • University of Florida, Gainesville, Florida, 32611, USA