title: Quantum Oscillation Signatures of Pressure-induced Topological Phase Transition in BiTeI.
abstract: We report the pressure-induced topological quantum phase transition of BiTeI single crystals using Shubnikov-de Haas oscillations of bulk Fermi surfaces. The sizes of the inner and the outer FSs of the Rashba-split bands exhibit opposite pressure dependence up to P = 3.35 GPa, indicating pressure-tunable Rashba effect. Above a critical pressure P ~ 2 GPa, the Shubnikov-de Haas frequency for the inner Fermi surface increases unusually with pressure, and the Shubnikov-de Haas oscillations for the outer Fermi surface shows an abrupt phase shift. In comparison with band structure calculations, we find that these unusual behaviors originate from the Fermi surface shape change due to pressure-induced band inversion. These results clearly demonstrate that the topological quantum phase transition is intimately tied to the shape of bulk Fermi surfaces enclosing the time-reversal invariant momenta with band inversion.
authors.affiliation: Department of Physics, Pohang University of Science and Technology, Pohang, 790-784, Korea.
authors.forename: Joonbum
authors.initials: J
authors.lastname: Park
authors.affiliation: Department of Physics, Pohang University of Science and Technology, Pohang, 790-784, Korea.
authors.forename: Kyung-Hwan
authors.initials: KH
authors.lastname: Jin
authors.affiliation: Department of Physics, Kyungpook National University, Daegu, 702-701, Korea.
authors.forename: Y J
authors.initials: YJ
authors.lastname: Jo
authors.affiliation: National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida, 32310, USA.
authors.forename: E S
authors.initials: ES
authors.lastname: Choi
authors.affiliation: Department of Physics, Ewha Womans University, Seoul, 120-750, Korea.
authors.forename: W
authors.initials: W
authors.lastname: Kang
authors.affiliation: Dresden High Magnetic Field Laboratory, Helmholtz-Zentrum Dresden-Rossendorf, Dresden, D-01314, Germany.
authors.forename: E
authors.initials: E
authors.lastname: Kampert
authors.affiliation: Department of Applied Physics, Kyung Hee University, Yongin, 446-701, Korea.
authors.forename: J-S
authors.initials: JS
authors.lastname: Rhyee
authors.affiliation: Department of Physics, Pohang University of Science and Technology, Pohang, 790-784, Korea.
authors.forename: Seung-Hoon
authors.initials: SH
authors.lastname: Jhi
authors.affiliation: Department of Physics, Pohang University of Science and Technology, Pohang, 790-784, Korea.
authors.forename: Jun Sung
authors.initials: JS
authors.lastname: Kim