Institut für Theoretische Physik, Universität Leipzig, D-04103 Leipzig, Germany.
Phys Rev Lett. 2013 Feb 15;110(7):076806. doi: 10.1103/PhysRevLett.110.076806.
The quantum Hall state at total filling factor ν(T)=1 in bilayer systems realizes an exciton condensate and exhibits a zero-bias tunneling anomaly, similar to the Josephson effect in the presence of fluctuations. In contrast to conventional Josephson junctions, no Fraunhofer diffraction pattern has been observed, due to disorder induced topological defects, so-called merons. We consider interlayer tunneling in the presence of microwave radiation, and predict Shapiro steps in the tunneling current-voltage characteristic despite the presence of merons. Moreover, the Josephson oscillations can also be observed as resonant features in the microwave dynamical conductance.
在双层系统中，总填充因子 ν(T)=1 的量子霍尔态实现了激子凝聚体，并表现出类似于存在涨落时的约瑟夫森效应的零偏压隧道反常现象。与传统的约瑟夫森结不同，由于无序诱导的拓扑缺陷，即所谓的 merons，没有观察到夫琅禾费衍射图案。我们考虑在微波辐射存在的情况下的层间隧道，并且尽管存在 merons，但预测隧道电流-电压特性中的 Shapiro 台阶。此外，约瑟夫森振荡也可以作为微波动态电导中的共振特征观察到。
