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Regensburg 2016 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 15: Poster session I

MM 15.22: Poster

Montag, 7. März 2016, 18:00–20:00, Poster B3

Quantum Oscillation Signatures of Pressure-induced Topological Phase Transition in BiTeI — •Joonbum Park1,2, Kyung-Hwan Jin3, Geunsik Lee4, Youn Jung Jo5, Eun Sang Choi6, Woun Kang7, Erik Kampert8, Jong-Soo Rhyee9, Seung-Hoon Jhi10, and Jun Sung Kim101Max-Planck-Institute for Chemical Physics of Soilds, Dresden, Germany — 2Max Planck Center for Complex Phase Materials, Pohang, South Korea — 3University of Utah, Salt Lake City, Utah, USA — 4UNIST, Ulsan, South Korea — 5Kyungpuk University, Daegu, South Korea — 6National High Magnetic Field Laboratory, Tallahassee, Florida, USA — 7Ewha Womens’ University, Seoul, South Korea — 8Dresden High Magnetic Field Laboratory, Dresden, Germany — 9Kyung-Hee University, Suwon, South Korea — 10POSTECH, Pohang, South Korea

We report the pressure-induced topological quantum phase transition of BiTeI single crystals using Shubnikov-de Haas oscillations of bulk Fermi surfaces. Above a critical pressure P ∼ 2GPa, 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.

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