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- W4221003944 abstract "For three-dimensional metals, Landau levels disperse as a function of the magnetic field and the momentum wave number parallel to the field. In this two-dimensional parameter space, it is shown that two conically dispersing Landau levels can touch at a diabolical point---a Landau-Dirac point. The conditions giving rise to Landau-Dirac points are shown to be magnetic breakdown (field-driven quantum tunneling) and certain crystallographic spacetime symmetry. Both conditions are realizable in topological nodal-line metals, as we exemplify with the material candidates $mathrm{Ca}{X}_{3}$ $(X=mathrm{As},mathrm{P})$. The experimental fingerprints of a Landau-Dirac point include (a) anomalous ``batman''-like peaks in the magnetoresistance, (b) circular Landau-Fermi surfaces revealed by angle-dependent ultrasonic attenuation, and (c) the tunability of the frequency onset of optical absorption to zero." @default.
- W4221003944 created "2022-04-03" @default.
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- W4221003944 date "2022-01-28" @default.
- W4221003944 modified "2023-10-17" @default.
- W4221003944 title "Diabolical touching point in the magnetic energy levels of topological nodal-line metals" @default.
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- W4221003944 doi "https://doi.org/10.1103/physrevb.105.045141" @default.
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