一维量子导体间非相干耦合的输运增强
Transport enhancement from incoherent coupling between one-dimensional quantum conductors
摘要：
研究了自旋为1/2的粒子在海森堡XXZ哈密顿量下的高度各向异性二维晶格的非平衡输运性质。晶格的各向异性使我们能够在有限温度下将系统近似为非相干耦合的一维链阵列。我们发现，在强链内相互作用的制度，弱链间耦合显着提高自旋输运的驱动系统。有趣的是，我们发现这种增强随着链的长度而增加，这与超扩散自旋输运有关。我们描述了这种效应背后的机制，将其与失相引起的单链中的类似现象进行比较，并解释了为什么前者要强得多。
英文摘要：
We study the non-equilibrium transport properties of a highly anisotropic two-dimensional lattice of spin-1/2 particles governed by a Heisenberg XXZ Hamiltonian. The anisotropy of the lattice allows us to approximate the system at finite temperature as an array of incoherently coupled one-dimensional chains. We show that in the regime of strong intrachain interactions, the weak interchain coupling considerably boosts spin transport in the driven system. Interestingly, we show that this enhancement increases with the length of the chains, which is related to superdiffusive spin transport. We describe the mechanism behind this effect, compare it to a similar phenomenon in single chains induced by dephasing, and explain why the former is much stronger.
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