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 Park^1,2, Kyung-Hwan Jin³, Geunsik Lee⁴, Youn Jung Jo⁵, Eun Sang Choi⁶, Woun Kang⁷, Erik Kampert⁸, Jong-Soo Rhyee⁹, Seung-Hoon Jhi¹⁰, and Jun Sung Kim¹⁰ — ¹Max-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.