Angle resolved photoemission studies of the Rashba states in ferroelectric GeTe

ORAL

Abstract

There has been significant increase in the research of spin orbit coupling (SOC) induced exotic phenomena. The Rashba effect, theoretically predicted to exist, is one of the SOC related phenomena. The phenomenon was later experimentally observed in the surface states of metals and topological insulators as well as interfaces of hetero structures that have inversion symmetry breaking (ISB). Even bulk states with intrinsic ISB such as BiTe is found to have Rashba split bands. It was very recently proposed that ferroelectric GeTe has Rashba effect in the bulk. This is a unique situation where ISB is provided not by the structure ISB but by an electrical polarization. We have performed angle-resolved photoemission spectroscopy (ARPES) on GeTe single crystals to investigate the unique bulk Rashba state. Our results indeed show the existence of a Rashba-type band splitting as theoretically predicted. We discuss various aspect of the Rashba state in GeTe.

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Authors

  • Beomyoung Kim

    Institute of Physics and Applied Physics, Yonsei University, Seoul, 120-749, Korea Advanced Light Source, Lawrence Berkeley National laboratory, Berke, Institute of Physics and Applied physics, Yonsei University, 134 Shinchon-Dong, Seodaemun-Gu, Seoul 120-749, Republic of Korea

  • Wonshik Kyung

    Yonsei Univ, Institute of Physics and Applied physics, Yonsei University, 134 Shinchon-Dong, Seodaemun-Gu, Seoul 120-749, Republic of Korea

  • Garam Han

    Institute of Physics and Applied Physics, Yonsei University, Seoul, 120-749, Korea, Institute of Physics and Applied physics, Yonsei University, 134 Shinchon-Dong, Seodaemun-Gu, Seoul 120-749, Republic of Korea

  • Yeongkwan Kim

    Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.

  • Jonathan Denlinger

    Advanced Light Source, Lawrence Berkeley National laboratory, Berkeley, California 94720, USA, Lawrence Berkeley National Laboratory, Lawrence Berkeley Nat'l Lab, Advanced Light Source, Lawrence Berkeley National Laboratory, Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.

  • In Chung

    Graduate School of Nanoscience and Technology, KAIST, 291 Daehak-ro, Yuseoung-gu, Daejon 305-701, Republic of Korea

  • Changyoung Kim

    Institute of Physics and Applied Physics, Yonsei University, Seoul, 120-749, Korea, Institute of Physics and Applied physics, Yonsei University, 134 Shinchon-Dong, Seodaemun-Gu, Seoul 120-749, Republic of Korea