Journal
PHYSICAL REVIEW LETTERS
Volume 120, Issue 20, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.120.200603
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Funding
- SUTD-MIT IDC [IDG31600107]
- Singapore Ministry of Education, Singapore Academic Research Fund Tier-I [SUTDT12015005]
- CNPq (Brazil)
- INFN through the project QUANTUM
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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 = 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 rnagnon excitations between the two halves of the chain.
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