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http://hdl.handle.net/1843/58543| Type: | Artigo de Periódico |
| Title: | Perfect diode in quantum spin chains |
| Authors: | Vinitha Balachandran Giuliano Benenti Emmanuel Araújo Pereira Giulio Casati Dario Poletti |
| Abstract: | 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. |
| Subject: | Cadeia de spins Sistemas quânticos Quantum transport |
| language: | eng |
| metadata.dc.publisher.country: | Brasil |
| Publisher: | Universidade Federal de Minas Gerais |
| Publisher Initials: | UFMG |
| metadata.dc.publisher.department: | ICX - DEPARTAMENTO DE FÍSICA |
| Rights: | Acesso Restrito |
| metadata.dc.identifier.doi: | https://doi.org/10.1103/PhysRevLett.120.200603 |
| URI: | http://hdl.handle.net/1843/58543 |
| Issue Date: | 2018 |
| metadata.dc.url.externa: | https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.120.200603 |
| metadata.dc.relation.ispartof: | Physical Review Letters |
| Appears in Collections: | Artigo de Periódico |
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