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Observation of Chiral Phonons with Giant Magnetic Moments in a Topological Crystalline Insulator

ORAL

Abstract

Chiral phonons present peculiar properties in magnetic fields such as: magnetic circular dichroism, phonon Zeeman effect and phonon diamagnetic shift. Recent experimental studies reported magnetic moment values in a broad range up to several Bohr magnetons. On the other hand, theoretical reports predicted the dependence of the phonon magnetic moment on electronic contributions. Here, we present experiments in a set of thin films of the pseudobinary alloy Pb(1−x)Sn(x)Te which is known to show an x-dependent topological phase transition for x > 0.32 and has exhibited chiral phonons in strong magnetic fields for x = 0. At low temperatures and under magnetic fields up to 29.5 T, two optical phonons modes acquired circular polarization with opposite handedness. While the topologically trivial films (x

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Publication: arXiv: 2208.12235 (25 Aug 2022)

Presenters

  • Felix G Hernandez

    University of Sao Paulo

Authors

  • Felix G Hernandez

    University of Sao Paulo

  • Andrey Baydin

    Rice University

  • Swati Chaudhary

    Northeastern University, University at Texas at Austin, Caltech, The University of Texas at Austin, Northeastern University, Massachusetts Institute of Technology, University of Texas at Austin, The university of Texas at Austin

  • Fuyang Tay

    Rice University

  • Ikufumi Katayama

    Yokohama National University

  • Jun Takeda

    Yokohama National University

  • Hiroyuki Nojiri

    Tohoku University

  • Anderson Okazaki

    Brazilian Center for Research in Energy and Materials

  • Paulo Rappl

    Instituto Nacional de Pesquisas Espaciais

  • Eduardo Abramof

    Instituto Nacional de Pesquisas Espaciais

  • Martin A Rodriguez-vega

    Theoretical Division, Los Alamos National Laboratory, University of Texas at Austin, University of Texas at Austin, Northeastern University

  • Gregory A Fiete

    Northeastern University, Northeastern University, Massachusetts Institute of Technology

  • Junichiro Kono

    Rice University