论文标题
通用约瑟夫森二极管效应
Universal Josephson diode effect
论文作者
论文摘要
我们提出了一种在短约瑟夫森连接中的约瑟夫森二极管效应的通用机制。所提出的机制是由于有限的库珀配对动量引起的，并且是倒置和时反转对称性的同时破裂的体现。二极管效率高达40％，对应于相反方向的关键电流之间的不对称性$ i_ {c+}/i_ {c-} \ $ 230％。我们表明，这是由Andreev结合状态能的多普勒移位和连续体的相位非对称电流引起的。最后，我们提出了一个简单的方案，用于实现有限的摩托车配对，该方案不依赖于自旋轨道耦合，因此大大扩展了现有平台以观察超恒星二极管效应。
We propose a universal mechanism for the Josephson diode effect in short Josephson junctions. The proposed mechanism is due to finite Cooper pair momentum and is a manifestation of simultaneous breaking of inversion and time-reversal symmetries. The diode efficiency is up to 40%, which corresponds to an asymmetry between the critical currents in opposite directions $I_{c+}/I_{c-} \approx$ 230%. We show that this arises from both the Doppler shift of the Andreev bound state energies and the phase-independent asymmetric current from the continuum. Finally, we propose a simple scheme for achieving finite-momentum pairing, which does not rely on spin-orbit coupling and thus greatly expands existing platforms for the observation of supercurrent diode effects.
