Tunneling Seebeck and Anomalous Nernst effects in three-dimensional topological insulators

ORAL

Abstract

We theoretically investigate the longitudinal (Seebeck) and transverse (Nernst) thermopowers generated by thermally-induced tunneling across a magnetic barrier on the surface of a three-dimensional insulator. As a manifestation of Klein tunneling, the tunneling Seebeck coefficient exhibits oscillatory behavior with respect to the barrier thickness. Moreover, in spite of the absence of a source of spin polarization (only the barrier is magnetic), the tunneling anomalous Nernst coefficient is not only finite but can even be much larger than its Seebeck counterpart.

*This work was supported by DFG Grant No. SCHA 1899/1-1 (B.S.), U.S. ONR Grant No. N000141310754 (B.S., A.M.-A.), U.S. DOE, Office of Science BES, under Award DE-SC0004890 (I.Z.)

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Authors

  • Chenghao Shen

    • State University of New York at Buffalo

  • Benedikt Scharf

    • State Univ of NY - Buffalo
    • State University of New York at Buffalo
    • University at Buffalo - SUNY

  • Alex Matos-Abiague

    • State University of New York at Buffalo
    • University at Buffalo - SUNY
    • University at Buffalo

  • Igor Zutic

    • University at Buffalo
    • State University of New York at Buffalo
    • SUNY at Buffalo
    • Dept. of Physics, University at Buffalo, State University of New York
    • University at Buffalo - SUNY
    • SUNY Buffalo