A phase-coherent state of electron–hole pairs may emerge in two-layer n–p systems, which is generated by the Coulomb attraction of electrons of the n-layer to holes of the p-layer. Unlike a Josephson junctions, the order parameter phase in n–p bilayers is locked by interlayer tunneling matrix elements T12. The phase locking determines the response of the electron–hole condensate to the electric voltage between the layers: the phase is constant at low voltages V Vc. The change in the system dynamics at V = Vc results in a peak along the differential tunneling conductance. The width of the Vc peak is proportional to the absolute value of the tunneling matrix element |T12|, while its height does not depend on |T12|. Thus, for small |T12| the peak is tall and narrow. In the case of long two-layer systems, a magnetic field parallel to the layers significantly reduces the peak height. In small two-layer systems, the height of the tunneling conductance peak as a function of a parallel magnetic field is similar to the Fraunhofer diffraction pattern. The interlayer differential tunneling conductance peak is also strongly suppressed by temperature, due to thermal interlayer voltage fluctuations.

中文翻译：

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具有电子-空穴耦合的两层系统中的隧道（评论文章）

电子-空穴对的相位相干状态可能出现在两层 n-p 系统中，这是由 n 层电子对 p 层空穴的库仑吸引力产生的。与约瑟夫森结不同，n-p 双层中的顺序参数相位被层间隧道矩阵元素 T12 锁定。锁相决定了电子-空穴凝聚物对层间电压的响应：相位在低电压 V Vc 下是恒定的。V = Vc 时系统动力学的变化导致沿差分隧穿电导的峰值。Vc 峰的宽度与隧穿矩阵元素的绝对值|T12| 成正比，而其高度与|T12| 无关。因此，对于小 |T12| 峰高而窄。在长的两层系统的情况下，平行于层的磁场显着降低了峰高。在小型两层系统中，作为平行磁场函数的隧道电导峰的高度类似于夫琅禾费衍射图。由于热层间电压波动，层间差分隧穿电导峰也受到温度的强烈抑制。