论文标题
二维电子气体中配对和nematicity的竞争
Competition of Pairing and Nematicity in the Two-Dimensional Electron Gas
论文作者
论文摘要
由于其极丰富的相图，暴露于垂直磁场的二维电子气体已成为强烈和持续研究的主题。在该系统中，一个特别有趣的问题是半填充的Landau级别，那里的复合材料效费，由复合材料的配对不稳定产生的分数量子厅状态以及在半填充的$ n = 0 $ n = 0 $，$ n = 1 $ n = 1 $，以及$ n \ geq 2 $ landau landau lastau lastau lastau lastau lastau lastau中观察到了量子霍尔的nematic。因此，不同的基础状态在不同的半填充兰道水平上发展。当据报道，在半填充$ n = 1 $ landau水平的情况下，据报道了配对的分数量子厅州和量子厅列表的证据，这种情况最近发生了变化。此外，发现了这两个有序状态之间的直接量子相变。这些结果凸显了配对与nematicities之间的紧密联系，这是在良好且低的疾病环境中，当前在几个强相关系统中引起的这个话题。
Due to its extremely rich phase diagram, the two-dimensional electron gas exposed to perpendicular magnetic field has been the subject of intense and sustained study. One particularly interesting problem in this system is that of the half-filled Landau level, where the Fermi sea of composite fermions, a fractional quantum Hall state arising from a pairing instability of the composite fermions, and the quantum Hall nematic were observed in the half-filled $N=0$, $N=1$, and $N \geq 2$ Landau levels, respectively. Thus different ground states developed in different half-filled Landau levels. This situation has recently changed, when evidence for both the paired fractional quantum Hall state and the quantum Hall nematic was reported in the half-filled $N=1$ Landau level. Furthermore, a direct quantum phase transition between these two ordered states was found. These results highlight an intimate connection between pairing and nematicity, a topic of current interest in several strongly correlated systems, in a well-understood and low disorder environment.
