非均匀磁场与负微分电导相互作用引起的巨自旋流整流
Giant spin current rectification due to the interplay of negative differential conductance and a non-uniform magnetic field
摘要：
在XXZ链中，当链中的相互作用和耗散驱动的偏置足够大时，自旋输运可以被显著抑制。这种负微分电导现象是由于在链的边缘处形成两个相反极化的铁磁畴引起的。在这里，我们表明，这种多体效应，结合非均匀的磁场，可以允许一个高度的控制的自旋电流。特别是，通过研究二分局部磁场的所有可能组合，我们发现，其中磁场对链的一半指向上而对另一半指向下的配置可以导致巨大的自旋电流整流，例如，对于具有$8$自旋的系统，高达$10^8$。我们的研究结果表明，整流可以增加系统的大小。
英文摘要：
In XXZ chains, spin transport can be significantly suppressed when the interactions in the chain and the bias of the dissipative driving are large enough. This phenomenon of negative differential conductance is caused by the formation of two oppositely polarized ferromagnetic domains at the edges of the chain. Here we show that this many-body effect, combined with a non-uniform magnetic field, can allow a high degree of control of the spin current. In particular, by studying all the possible combinations of a dichotomous local magnetic field, we found that a configuration in which the magnetic field points up for half of the chain and down for the other half, can result in giant spin-current rectification, for example up to $10^8$ for a system with $8$ spins. Our results show clear indications that the rectification can increase with the system size.
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