Diabolical touching point in the magnetic energy levels of topological nodal-line metals | |
Article | |
关键词: QUANTUM OSCILLATIONS; BLOCH ELECTRONS; COUPLED ORBITS; ABSORPTION; BREAKDOWN; PHASE; SUSCEPTIBILITY; QUANTIZATION; INTERSECTION; DYNAMICS; | |
DOI : 10.1103/PhysRevB.105.045141 | |
来源: SCIE |
【 摘 要 】
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 CaX3 (X = As, 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.
【 授权许可】
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