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Transport chirality generated by a tunable tilt of Weyl nodes in a van der Waals topological magnet

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  • Afrin N. Tamanna

    (The City College of New York—CUNY)

  • Ayesha Lakra

    (The City College of New York—CUNY)

  • Xiaxin Ding

    (The City College of New York—CUNY)

  • Entela Buzi

    (The City College of New York—CUNY)

  • Kyungwha Park

    (Virginia Tech)

  • Kamil Sobczak

    (University of Warsaw)

  • Haiming Deng

    (The City College of New York—CUNY)

  • Gargee Sharma

    (Indian Institute of Technology-Mandi)

  • Sumanta Tewari

    (Clemson University)

  • Lia Krusin-Elbaum

    (The City College of New York—CUNY
    City University of New York Graduate Center)

Abstract

Chirality — a characteristic handedness that distinguishes ‘left’ from ‘right’—is a fundamental property of quantum particles under broken symmetry intimately connected to their spins. Chiral fermions have been identified in Weyl semimetals through their unique electrodynamics arising from ‘axial’ charge imbalance between pairs of chiral Weyl nodes—the topologically protected ‘relativistic’ crossings of electronic bands. Chiral magnetotransport phenomena critically depend on the details of electronic band structure. However, the putative emergence of chiral electronic channels through shape altering of Weyl nodes is yet to be revealed. Here, we detect chirality-endowed linear conduction channels promoted by a tilt of Weyl bands in inversion-symmetric Weyl ferromagnet MnSb2Te4. The tuning of Weyl nodes is controlled with ionic hydrogen, which heals the system’s (Mn-Te) bond disorder and lowers the internode scattering. The reshaped Weyl states feature a doubled Curie temperature ≳50 K and a strong angular transport chirality synchronous with a rare field-antisymmetric longitudinal resistance—a low-field tunable ‘chiral switch’ that is rooted in the interplay of Berry curvature, chiral anomaly and a hydrogen-mediated form of Weyl nodes.

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  • Afrin N. Tamanna & Ayesha Lakra & Xiaxin Ding & Entela Buzi & Kyungwha Park & Kamil Sobczak & Haiming Deng & Gargee Sharma & Sumanta Tewari & Lia Krusin-Elbaum, 2024. "Transport chirality generated by a tunable tilt of Weyl nodes in a van der Waals topological magnet," Nature Communications, Nature, vol. 15(1), pages 1-9, December.
  • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-53319-w
    DOI: 10.1038/s41467-024-53319-w
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