磁场倾斜对nu=1量子霍尔双层膜中逆流输运的锁定和解锁
Locking and unlocking of the counterflow transport in nu=1 quantum Hall bilayers by tilting of magnetic field
摘要：
由于层间隧穿引起的完全泄漏，由超流激子提供的量子霍尔双层膜中的逆流输运被锁定在小的输入电流。我们证明了在垂直于电流方向的平面内，磁场的倾斜可以控制逆流临界电流I_c^{CF}，在该电流以上，系统可以实现逆流输运.该效果相对于倾斜角度是不对称的。解锁伴随着系统从直流切换到交流。约瑟夫森州。当流过系统的电流超过临界值I_c^T时，对于隧穿设置发生类似的切换。在零倾角时，隧道临界电流与逆流临界电流之间的关系为I_c^T=2 I_c^{CF}。比较了面内磁场分量B_ \parallel对临界电流I_c^{CF}和I_c^T的影响。面内磁场降低了隧道临界电流，并且这种降低相对于倾斜角是对称的。结果表明，I_c^{CF}和I_c^T之间的差异在磁场中是至关重要的|B_ \parallel| \lesssim λ_0/d λ_J，其中λ_0是通量量子，d是层间距离，λ_J是约瑟夫森长度。在较大的B_ \parallel处，临界电流I_c^{CF}和I_c^T几乎彼此重合。
英文摘要：
The counterflow transport in quantum Hall bilayers provided by superfluid excitons is locked at small input currents due to a complete leakage caused by the interlayer tunneling. We show that the counterflow critical current I_c^{CF} above which the system unlocks for the counterflow transport can be controlled by a tilt of magnetic field in the plane perpendicular to the current direction. The effect is asymmetric with respect to the tilting angle. The unlocking is accompanied by switching of the systems from the d.c. to the a.c. Josephson state. Similar switching takes place for the tunneling set-up when the current flowing through the system exceeds the critical value I_c^T. At zero tilt the relation between the tunnel and counterflow critical currents is I_c^T=2 I_c^{CF}. We compare the influence of the in-plane magnetic field component B_\parallel on the critical currents I_c^{CF} and I_c^T. The in-plane magnetic field reduces the tunnel critical current and this reduction is symmetric with respect to the tilting angle. It is shown that the difference between I_c^{CF} and I_c^T is essential at field |B_\parallel|\lesssim ϕ_0/d λ_J, where ϕ_0 is the flux quantum, d is the interlayer distance, and λ_J is the Josephson length. At larger B_\parallel the critical currents I_c^{CF} and I_c^T almost coincide each other.
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