海森堡链Y结中的量子自旋环行器
Quantum spin circulator in Y junctions of Heisenberg chains
摘要：
我们表明，量子自旋环行器，一个非互易设备，路由自旋电流没有任何电荷传输，可以实现在Y结的相同的自旋$1/2$海森堡链耦合的手征三自旋相互作用。利用玻色化、边界共形场论和密度矩阵重整化群模拟，我们发现在分离一个不连续链和一个仅自旋的三通道近藤效应的临界点处，出现了一个具有最大不对称自旋电导的手征不动点.我们认为，网络的自旋链Y结提供了一个可控的方法来构建长期寻求的手性自旋液相。
英文摘要：
We show that a quantum spin circulator, a nonreciprocal device that routes spin currents without any charge transport, can be achieved in Y junctions of identical spin-$1/2$ Heisenberg chains coupled by a chiral three-spin interaction. Using bosonization, boundary conformal field theory, and density-matrix renormalization group simulations, we find that a chiral fixed point with maximally asymmetric spin conductance arises at a critical point separating a regime of disconnected chains from a spin-only version of the three-channel Kondo effect. We argue that networks of spin-chain Y junctions provide a controllable approach to construct long-sought chiral spin liquid phases.
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