Unconventional mesoscopic transport regimes in kagome magnets

ORAL

Abstract

The kagome lattice is a versatile ingredient for realizing a range of exciting physical phenomena including flat bands, Dirac fermions, strong correlation, unconventional charge density waves, and superconductivity. Specifically, materials hosting such lattice structures, such as kagome magnets and superconductors, have demonstrated anomalous transport properties, such as strange metallic resistivity and anisotropic magnetic susceptibilities. One transport aspect that is underexplored is the possibility of realizing a hydrodynamic regime for electron fluid formation. The kagome magnets TbMn6Sn6 (a Chern ferrimagnet) and Mn3Ge (a Weyl semimetal antiferromagnet) have interesting electronic and thermal conductivities, with the two showing large and opposing deviations from the Wiedemann-Franz law and Mott relation. Herein, we study whether such conductivities can be decoupled into independent diffusive modes and explore the possible emergence of hydrodynamics in finite channel geometries using a combination of ab initio calculations and numerical simulations of the Boltzmann transport equation. Our work aims to rationalize the transport of kagome magnets by resolving their temperature-dependent electron and phonon scattering mechanisms and exploring their interplay with quasiparticle mean free paths and Fermi surface topologies.

* This work is supported by the Office of Naval Research grant no. 13672292 and by the Gordon and Betty Moore Foundation grant number no. 8048. P.N. gratefully acknowledges support from the John Simon Guggenheim Memorial Foundation (Guggenheim Fellowship).

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Presenters

  • Benjamin Tan

    University of California, Los Angeles

Authors

  • Matthew Shammami

    University of California, Los Angeles

  • Benjamin Tan

    University of California, Los Angeles

  • Prineha Narang

    College of Letters and Science, University of California, Los Angeles (UCLA), CA, USA., University of California Los Angeles, College of Letters and Science, University of California, Los Angeles (UCLA), UCLA, University of California, Los Angeles, College of Letters and Science, University of California, Los Angeles, Harvard University