论文标题
Zrte $ _5 $中的磁冻结和异常大厅效应
Magnetic freeze-out and anomalous Hall effect in ZrTe$_5$
论文作者
论文摘要
当磁场将电子气体限制在其最低的自旋偏振水平时，实现了超量子极限。在这里，我们表明，在此极限下，电子掺杂的Zrte $ _5 $显示了金属 - 绝缘体的过渡，然后在低温下进行了大厅的标志变化和Seebeck效应。我们将这种过渡归因于电荷载体的磁性冻结在电离杂质上。电荷载体密度的降低使旋转偏振电子的异常大厅响应取代。这种行为与通常的磁冻结场景不一致，因为它具有微小的费米能量，极度狭窄的带隙和一个较大的$ g $ factor。我们讨论了此异常贡献的不同可能的来源（内在或外在）。
The ultra-quantum limit is achieved when a magnetic field confines an electron gas in its lowest spin-polarised Landau level. Here we show that in this limit, electron doped ZrTe$_5$ shows a metal-insulator transition followed by a sign change of the Hall and Seebeck effects at low temperature. We attribute this transition to a magnetic freeze-out of charge carriers on the ionised impurities. The reduction of the charge carrier density gives way to an anomalous Hall response of the spin-polarised electrons. This behaviour, at odds with the usual magnetic freeze-out scenario, occurs in this Dirac metal because of its tiny Fermi energy, extremely narrow band gap and a large $g$-factor. We discuss the different possible sources (intrinsic or extrinsic) for this anomalous Hall contribution.
