Higher harmonics of quantum oscillations uncover Dirac Fermons in LaRhIn<sub>5</sub>

Bulletin of the American Physical Society

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APS March Meeting 2020

Volume 65, Number 1

Monday–Friday, March 2–6, 2020; Denver, Colorado

Session W59: Weyl semimetal, Transport I

8:00 AM–10:48 AM, Friday, March 6, 2020
Room: Mile High Ballroom 3C

Sponsoring Unit: DMP

Abstract: W59.00007 : Higher harmonics of quantum oscillations uncover Dirac Fermons in LaRhIn₅

Abstract

Presenter:

Aris Alexandradinata
(University of Illinois at Urbana-Champaign)

Authors:

Aris Alexandradinata
(University of Illinois at Urbana-Champaign)

Chunyu Guo
(Institute of Material Science and Engineering, Ecole Polytechnique Federale de Lausanne)

Carsten Putzke
(Institute of Material Science and Engineering, Ecole Polytechnique Federale de Lausanne)

Fengren Fan
(Max Planck Institute for Chemical Physics of Solids)

Shengnan Zhang
(Institute of Material Science and Engineering, Ecole Polytechnique Federale de Lausanne)

QuanSheng Wu
(Institute of Material Science and Engineering, Ecole Polytechnique Federale de Lausanne)

Oleg V. Yazyev
(Institute of Material Science and Engineering, Ecole Polytechnique Federale de Lausanne)

Kent Shirer
(Max Planck Institute for Chemical Physics of Solids)

Maja Bachmann
(Max Planck Institute for Chemical Physics of Solids)

Eric Bauer
(Los Alamos National Laboratory)

Filip Ronning
(Los Alamos National Laboratory)

Claudia Felser
(Max Planck Institute for Chemical Physics of Solids)

Yan Sun
(Max Planck Institute for Chemical Physics of Solids)

Philip Moll
(Institute of Material Science and Engineering, Ecole Polytechnique Federale de Lausanne)

Quantum oscillations are commonly used to experimentally diagnose the band topology of a semimetal. When the cyclotron orbit encloses a topological defect, it is often presumed that the nontrivial Berry phase results in a π-phase shift of the fundamental harmonic. However, this presumption neglects how spin-orbit coupling renders the Berry phase a continuously varying quantity, and ignores the Zeeman interaction with the spin-orbit-induced magnetic moment. Here, we overcome these shortcomings and demonstrate how to rigorously identify three-dimensional Dirac fermions from the higher harmonics of quantum oscillations. Applying this method to the intermetallic LaRhIn₅, we unambiguously identify the nontrivial Berry phase of a topological Fermi pocket with a small frequency ≈ 7T, despite the presence of large, trivial Fermi pockets which dominate transport by orders of magnitude. Our analysis identifies LaRhIn₅ as a 3D Dirac-point metal, revising a previous proposal of LaRhIn₅ as a nodal-line semimetal by Mikitik et. al. [Phys. Rev. Lett. 93, 106403 (2004)]. The electronic similarity of LaRhIn₅ to the prototypical heavy-fermion superconductors Ce(Co,Rh,Ir)In₅ further suggests them as prime candidates for strongly-correlated Dirac systems.

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Bulletin of the American Physical Society

APS March Meeting 2020

Volume 65, Number 1

Monday–Friday, March 2–6, 2020; Denver, Colorado

Session W59: Weyl semimetal, Transport I

Abstract: W59.00007 : Higher harmonics of quantum oscillations uncover Dirac Fermons in LaRhIn5

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Authors:

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Abstract: W59.00007 : Higher harmonics of quantum oscillations uncover Dirac Fermons in LaRhIn₅