Angle Resolved Photoemission Study of Surface States and Orbital Angular Momentum Structure in SrTiO$_{3}$

ORAL

Abstract

The theoretical understanding of spin orbit coupling (SOC) effects in SrTiO$_{3}$ (STO) and KTaO$_{3}$ (KTO) is still in its infancy. To have a better understanding of these effects, we have performed linear and circular dichroism angle resolved photoemission spectroscopy (LD- and CD-ARPES) of surface states of STO and KTO to measure the energy band and local orbital angular momentum (OAM) structure. CD-ARPES measurement revels the OAM chiral structure. Using ARPES results and a new OAM based Hamiltonian we try to explain the origin of band splitting. We believe that OAM has an important role in the surface band splitting and the chiral structure reveled by CD-ARPES.

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Authors

  • Shoresh Soltani

    Institute of Physics and Applied Physics, Yonsei University, Seoul, 120-749, Korea

  • 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

  • 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

  • Soohyun Cho

    Institute of Physics and Applied Physics, Yonsei University, Seoul, 120-749, Korea

  • 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.

  • Mats Leandersson

    Beamline I3, Max-lab, SE-221 00, Lund, Sweden

  • 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