论文标题
超出伪源dirac材料的量子极限的量子振荡
Quantum oscillation beyond the quantum limit in pseudospin Dirac materials
论文作者
论文摘要
最近，在拓扑材料中极具磁场的电气，磁性和热电响应中的许多意外精细结构引起了极大的兴趣。我们提出了一种新的量子振荡机制，超出了狄拉克费米的强场量子极限。振荡的幅度远大于通常的shubnikov--de haas振荡。在磁场B中，振荡倾向于周期性，而不是1/b。振荡周期不取决于费米能的能量。这些行为无法用著名的Lifshitz-Kosevich公式描述。振荡源于一种机制，我们称之为最低兰道水平的反转，是由于伪传式dirac型Landau水平与真实旋转的Zeeman之间的竞争所产生的，而真实的Zeeman吐痰超出了量子限制。这种反转导致在极大的磁场处的费米能和电导率的振荡。该机制将有助于理解狄拉克材料中强场量子限制中观察到的意外精细结构。
Recently, many unexpected fine structures in electric, magnetic, and thermoelectric responses at extremely magnetic fields in topological materials have attracted tremendous interest. We propose a new mechanism of quantum oscillation beyond the strong-field quantum limit for Dirac fermions. The amplitude of the oscillation is far larger than the usual Shubnikov--de Haas oscillation. The oscillation tends to be periodic in the magnetic field B, instead of 1/B. The period of the oscillation does not depend on the Fermi energy. These behaviors cannot be described by the famous Lifshitz-Kosevich formula. The oscillation arises from a mechanism that we refer to as the inversion of the lowest Landau level, resulted from the competition between the pseudospin Dirac-type Landau levels and real-spin Zeeman spitting beyond the quantum limit. This inversion gives rise to the oscillation of the Fermi energy and conductivity at extremely large magnetic fields. This mechanism will be useful for understanding the unexpected fine structures observed in the strong-field quantum limit in Dirac materials.
