Perfect diode in quantum spin chains
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Universidade Federal de Minas Gerais
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Artigo de periódico
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We study the rectification of the spin current in XXZ chains segmented in two parts, each with a different anisotropy parameter. Using exact diagonalization and a matrix product state algorithm, we find that a large rectification (of the order of 10 4) is attainable even using a short chain of N ¼ 8 spins, when one-half of the chain is gapless while the other has a large enough anisotropy. We present evidence of diffusive transport when the current is driven in one direction and of a transition to an insulating behavior of the system when driven in the opposite direction, leading to a perfect diode in the thermodynamic limit. The above results are explained in terms of matching of the spectrum of magnon excitations between the two halves of the chain.
Abstract
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Cadeia de spins, Sistemas quânticos, Quantum transport
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Magnons, Nonequilibrium statistical mechanics, Open quantum systems, Quantum transport, Spin current
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https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.120.200603