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RIKEN Center for Emergent Matter Science Quantum Surface and Interface Research Unit

Unit Leader: Shuaihua Ji (Ph.D.)

Research Summary

Shuaihua  Ji(Ph.D.)

Our research unit focuses on the emergent phenomena on the surface/interface of the newly discovered topological related quantum materials, such as topological insulators and topological crystalline insulators. We are interested in the fundamental properties of those symmetry protected surface states. In particular, we are interested in topological surface states with the gap opening induced by the time reversal symmetry breaking, or gauge symmetry breaking, or interaction of two surface states through tunneling effect, which could lead to the exotic phenomena, such as surface quantum hall effect, topological magnetoelectric effect and topological superconducting.

Main Research Fields

  • Interdisciplinary Science & Engineering


  • Low dimensional materials
  • Semiconductor thin film
  • Low dimensional electronics
  • Topological electronics
  • Superconductor

Selected Publications

Papers with an asterisk(*) are based on research conducted outside of RIKEN.

  • 1.Chang, K., et al.:
    "Discovery of robust in-plane ferroelectricity in atomic-thick SnTe"
    Science 353, 274 (2016).
  • 2.Chang, K., Deng, P., Zhang, T. et al.:
    "Molecular beam epitaxy growth of superconducting LiFeAs film on SrTiO3(001) substrate"
    Europhysics Letters 109, 28003 (2015).
  • 3.* Ji, S.-H., Hannon, J. B., Tromp, R. M. et al.:
    "Atomic scale transport of epitaxial grapheme"
    Nature Materials 11,114(2012).
  • 4.* Ji, S.-H., Zhang, T., Fu, Y.-S. et al.:
    "Application of magnetic atom induced bound states in superconducting gap for chemical identification of single magnetic atoms"
    Applied Physics Letters 96, 073113(2010).
  • 5.* Chen, X., Fu, Y.-S., Ji, S.-H. et al.:
    "Probing superexchange interaction in molecular magnets by spin-flip spectroscopy and microscopy"
    Physical Review Letters 101, 197208(2008).
  • 6.* Ji, S.-H., Fu, Y.-S., Chen, X. et al.:
    "High-resolution scanning tunneling spectroscopy of magnetic-impurity-induced bound states in the superconducting gap of Pb thin-films"
    Physical Review Letters 100, 226801(2008).
  • 7.* Fu, Y.-S., Ji, S.-H., Chen, X. et al.,
    "Manipulating the Kondo resonance through quantum size effects"
    Physical Review Letters 99, 256601(2007).

Related Links

Lab Members

Principal investigator

Shuaihua Ji
Unit Leader

Contact Information

Room 506, Apartment 15, Tsinghua University, Beijing, China
Email: shuaihua.ji [at] riken.jp