论文标题
层间隧穿电流引起的激发型约瑟夫森效应：激烈的证据证明激子冷凝
Excitonic Josephson effect induced by interlayer tunneling current: robust evidence for exciton condensation
论文作者
论文摘要
约瑟夫森效应可被视为激子冷凝的惊人表现。有人建议通过施加层间隧穿电流来调整双层激子的冷凝水相。黄{\ it et al} [phys。莱特牧师。 $ \ bf 109 $，156802（2012）]证明，可以通过传递另一个边缘的第二个Interlayer隧道电流来控制任一边缘的层隧穿电流的临界值。我们成功地将这种新型耦合归因于隧道流产生的相对相引起的激子约瑟夫森效应，并表明黄的实验是激子凝结的非常强大的证据。此外，我们提出了一个新的建议：存在着关键的约瑟夫森电流，除了约瑟夫森耦合崩溃和外部电流更喜欢转换为边缘潮流，以满足Huang在$ \ pm 16na的第二个隧道电流上的观察 - 突然脱离了两个边缘，并伴随着大型跨层间的跨层间的跨层间式伏特。另外，我们通过测量环形激子约瑟夫森连接的诱导磁场来检测约瑟夫森电流。这项工作不仅解决了关于识别激子冷凝的长期不确定性，而且还为探索激子冷凝的新方向打开了方向。
The Josephson effect can be regarded as a striking manifestation of exciton condensation. It has been suggested to tune the condensate phase of bilayer excitons by applying interlayer tunneling current. A poorly-understood phenomenon observed by Huang {\it et al} [Phys. Rev. Lett. $\bf 109$, 156802 (2012)] demonstrates that the critical values of the interlayer tunneling current at either edge can be controlled by passing a second interlayer tunneling current at the other edge. We successfully attribute this novel coupling to excitonic Josephson effect induced by tunneling-current generated relative phases and indicate that Huang's experiment is very robust evidence for exciton condensation. We furthermore make a new proposal: there exists a critical Josephson current beyond which Josephson coupling collapses and external currents prefer to convert into edge-state currents to meet Huang's observation at the second tunneling current above $\pm$16nA -- a sudden decoupling of two edges accompanied by a large interedge voltage. Also, we make a feasible suggestion to detect Josephson current by measuring induced magnetic field of a ring-shaped excitonic Josephson junction. This work not only solves the long-standing uncertainty regarding the identification of exciton condensation but also opens a new direction to explore exciton condensation.
