论文标题
在时间周期性磁场下直至淋巴结线半度的量子振荡和Landau-Zener过渡
Quantum Oscillation and Landau-Zener transition in Untilted Nodal line semimetals under a time-periodic magnetic field
论文作者
论文摘要
当通过强磁场作用时，淋巴结线半法（NLSM）表现出有趣的量子振荡特性。我们研究了强直接（DC）和交替的（AC）磁场的综合作用，垂直于直至NLSM中的淋巴结平面，以探测低谎言Landau水平（LL）的行为，这些状态可能会定期变得无间隙，以适当选择的场参数。与稳定的振荡场变化相对于稳定的振动磁场对量子振荡现象产生了有趣的影响，每个周期极端两次穿越费米表面。此外，低能模式可以目睹兰道齐纳（Landau-Zener）就像价和传导带之间的过渡，从而提供了进一步的传导途径。我们讨论了这种过渡现象之后的慢速猝灭近似框架框架。接下来，我们还研究了与淋巴结环平行作用的振荡磁场的作用，在淋巴结环上，可以目睹低能的拓扑非平凡的磁振荡。因此，有了适当的参数，可以在振荡场扫描其周期中定期进行拓扑转换，以定期发生。
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.
