非线性自旋-超流输运中相干性的利用
Exploiting Coherence in Nonlinear Spin-Superfluid Transport
摘要：
我们展示了超流自旋电流之间的干涉如何赋予自旋电路相干逻辑功能。虽然流体动力学方面的线性响应集体自旋输运干扰功能，我们专注于非线性制度，其中的临界超电流是敏感的凝聚物在一个循环的几何形状积累的相位。我们建议通过电子门控来控制这个相位，调节自旋凝聚相干长度。因此，自旋超流的非线性方面自然有助于逻辑门的构建，独特地利用集体自旋流的相干性。反之亦然，这种功能可以用来揭示自旋超流体的基本性质。
英文摘要：
We show how the interference between superfluid spin currents can endow spin circuits with coherent logic functionality. While the hydrodynamic aspects of the linear-response collective spin transport obviate interference features, we focus on the nonlinear regime, where the critical supercurrent is sensitive to the phase accumulated by the condensate in a loop geometry. We propose to control this phase by electrical gating, tuning the spin-condensate coherence length. The nonlinear aspects of the spin superfluidity thus naturally lend themselves to the construction of logic gates, uniquely exploiting the coherence of collective spin currents. Vice versa, this functionality can be used to reveal the fundamental properties of spin superfluids.
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