周期磁场作用下非倾斜节线半金属的量子振荡和Landau-Zener相变
Quantum Oscillation and Landau-Zener transition in Untilted Nodal line semimetals under a time-periodic magnetic field
摘要：
节线半金属在强磁场作用下表现出有趣的量子振荡特性。我们研究了强直流（dc）和交变（ac）磁场的组合效应，垂直于节面在非倾斜的NLSM，以探测的行为的低躺朗道能级（LL）的状态，可以周期性地成为适当选择的场参数的无隙。振荡场的变化，而不是一个稳定的，有有趣的影响量子振荡现象的朗道管交叉费米面极端每周期两次。此外，低能量模式可以见证价带和导带之间的Landau-Zener样跃迁，提供进一步的传导途径。我们讨论了这种过渡现象的绝热脉冲近似慢淬的框架下。接下来，我们还研究了振荡磁场平行于节环的作用效果，在那里可以看到低能量下的拓扑非平凡磁振荡。因此，通过选择适当的参数，人们可以设计拓扑转换周期性地发生在这样的系统中，因为振荡场被扫过它的周期。
英文摘要：
Nodal line semimetals (NLSM) exhibit interesting quantum oscillation characteristics when acted upon by a strong magnetic field. We study the combined effect of strong direct (dc) and alternating (ac) magnetic field, perpendicular to the nodal plane in an untilted NLSM in order to probe the behavior of the low lying Landau level (LL) states that can periodically become gapless for suitably chosen field parameters. The oscillatory field variation, as opposed to a steady one, has interesting impact on the quantum oscillation phenomena with the Landau tubes crossing the Fermi surface extremally two times per cycle. Furthermore, the low energy modes can witness Landau-Zener like transitions between valence and conduction band providing further routes to conduction. We discuss such transition phenomena following the framework of adiabatic-impulse approximation for slow quenches. Next we also investigate the effect of oscillating magnetic field acting parallel to the nodal loop where topologically nontrivial magnetic oscillations at low energies can be witnessed. Therefore, with proper parameters chosen, one can engineer topological transitions to occur periodically in such systems as the oscillating field is swept through its cycles.
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