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Localized states of the topological flat bands in the 3<i>d</i> transition metal kagome compound

ORAL

Abstract

The kagome lattice can host both Dirac electrons and the flat band in the spectrum. With spin-orbit coupling, the flat band will acquire non-trivial topology. On the other hand, when the kinetic energy scale is quenched as with a flat band, the electron interactions could facilitate the formation of correlated phases. Hence, the kagome lattice system has the potential to open a door to study the interplay between topology and electron correlations. In synthesized kagome compounds, additional degrees of freedom such as the orbitals further enrich the physics. To elucidate the nature of the electronic structure, we perform the ab initio density functional theory calculations. We focus on the 3d transition metal kagome compound with topological flat bands, observed experimentally by angle-resolved photoemission spectroscopy. The effective Hamiltonians of these topological flat bands are investigated with the derivations of Wannier states. The implications of topological obstructions and crystalline symmetries are discussed. These localized Wannier functions with intricate spin and orbital texture in the real space reveal their origin from the frustrated kagome structure.

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Presenters

  • Shiang Fang

    Harvard University, Department of Physics and Astronomy, Rutgers University, Harvard, Department of Physics, Harvard University, Physics, Harvard University

Authors

  • Shiang Fang

    Harvard University, Department of Physics and Astronomy, Rutgers University, Harvard, Department of Physics, Harvard University, Physics, Harvard University

  • Min Gu Kang

    Massachusetts Institute of Technology MIT, Massachusetts Institute of Technology, Department of Physics, Massachusetts Institute of Technology, Physics, MIT

  • Linda Ye

    Massachusetts Institute of Technology, Massachusetts Institute of Technology MIT, Department of Physics, Massachusetts Institute of Technology, Physics, MIT

  • Hoi Chun Po

    Massachusetts Institute of Technology, MIT, Department of Physics, MIT, Department of Physics, Massachusetts Institute of Technology, Massachusetts Institute of Technology MIT

  • Jonathan Denlinger

    Lawrence Berkeley National Laboratory, Advanced Light Source, Lawrence Berkeley National Laboratory, Advanced Light Source, Lawrence Berkeley National Lab, Advanced Light Source, Advanced Light Source, E. O. Lawrence Berkeley National Laboratory

  • Chris Jozwiak

    Advanced Light Source, Lawrence Berkeley National Lab, Lawrence Berkeley National Laboratory, Advanced Light Source, Lawrence Berkeley National Laboratory, Advanced Light Source, E. O. Lawrence Berkeley National Laboratory, ALS, Lawrence Berkeley National Lab, Advanced Light Source

  • Aaron Bostwick

    Advanced Light Source, Lawrence Berkeley National Laboratory, Lawrence Berkeley National Laboratory, Advanced Light Source, Lawrence Berkeley National Lab, Advanced Light Source, E. O. Lawrence Berkeley National Laboratory, ALS, Lawrence Berkeley National Lab, Advanced Light Source

  • Eli Rotenberg

    Advanced Light Source, Lawrence Berkeley National Laboratory, Lawrence Berkeley National Laboratory, Advanced Light Source, Lawrence Berkeley National Lab, Advanced Light Source, E. O. Lawrence Berkeley National Laboratory, ALS, Lawrence Berkeley National Lab, Advanced Light Source

  • Joseph G Checkelsky

    Department of Physics, Massachusetts Institute of Technology, Department of Physics, Massachusetts Institute of Technology MIT, Massachusetts Institute of Technology, Massachusetts Institute of Technology MIT, Physics, MIT

  • Riccardo Comin

    Massachusetts Institute of Technology MIT, Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA, Massachusetts Institute of Technology, Department of Physics, Massachusetts Institute of Technology, Physics, MIT

  • Efthimios Kaxiras

    Harvard University, Department of Physics, Harvard University