Quantum Oscillations in the Zeroth Landau Level: Serpentine Landau Fan and the Chiral Anomaly

T. Devakul, Yves H. Kwan, S. L. Sondhi, S. A. Parameswaran

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1 Scopus citations

Abstract

We identify an unusual mechanism for quantum oscillations in nodal semimetals, driven by a single pair of Landau levels periodically closing their gap at the Fermi energy as a magnetic field is varied. These "zero Landau level"quantum oscillations (ZQOs) appear in the nodal limit where the zero-field Fermi volume vanishes and have distinctive periodicity and temperature dependence. We link the Landau spectrum of a two-dimensional (2D) nodal semimetal to the Rabi model, and show by exact solution that, across the entire Landau fan, pairs of opposite-parity Landau levels are intertwined in a "serpentine"manner. We propose 2D surfaces of topological crystalline insulators as natural settings for ZQOs. In certain 3D nodal semimetals, ZQOs lead to oscillations of anomaly physics. We propose a transport measurement capable of observing such oscillations, which we demonstrate numerically.

Original languageEnglish (US)
Article number116602
JournalPhysical review letters
Volume127
Issue number11
DOIs
StatePublished - Sep 10 2021
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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