Enhanced lifetimes of spin chains coupled to chiral edge states
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Title: | Enhanced lifetimes of spin chains coupled to chiral edge states |
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Authors: | Delgado Acosta, Fernando | Fernández-Rossier, Joaquín |
Research Group/s: | Grupo de Nanofísica |
Center, Department or Service: | Universidad de Alicante. Departamento de Física Aplicada |
Keywords: | Spin Hall | Decoherence | Relaxation | Adatoms | Kondo |
Knowledge Area: | Física de la Materia Condensada |
Issue Date: | 8-Apr-2019 |
Publisher: | IOP Publishing |
Citation: | New Journal of Physics. 2019, 21: 043008. doi:10.1088/1367-2630/ab116b |
Abstract: | We consider spin relaxation of finite-size spin chains exchanged coupled with a one-dimensional (1D) electron gas at the edge of a quantum spin Hall (QSH) insulator. Spin lifetimes can be enhanced due to two independent mechanisms. First, the suppression of spin-flip forward scattering inherent in the spin momentum locking of the QSH edges. Second, the reduction of spin-flip backward scattering due to destructive interference of the quasiparticle exchange, modulated by k F d, where d is the inter-spin distance and k F is the Fermi wavenumber of the electron gas. We show that the spin lifetime of the S = 1/2 ground state of odd-numbered chains of antiferromagnetically coupled S = 1/2 spins can be increased more than 4 orders of magnitude by properly tuning the product k F d and the spin size N, in strong contrast with the 1D case. Possible physical realizations together with some potential issues are also discussed. |
Sponsor: | JFR acknowledges financial support by FCT- The Portuguese Foundation for Science and Technology, under the project ‘PTDC/FIS-NAN/4662/2014’ (016656), MINECO-Spain (Grant No. MAT2016-78625-C2) and Generalitat Valenciana Prometeo2017/139. FD acknowledges financial support from Spanish Government through grants MAT2015-66888-C3-2-R, Basque Government, grant IT986-16 and Canary Islands program Viera y Clavijo (Ref. 2017/0000231). FD acknowledges the hospitality of the Departamento de Física Aplicada of the Universidad de Alicante. |
URI: | http://hdl.handle.net/10045/93731 |
ISSN: | 1367-2630 |
DOI: | 10.1088/1367-2630/ab116b |
Language: | eng |
Type: | info:eu-repo/semantics/article |
Rights: | © 2019 The Author(s). Published by IOP Publishing Ltd on behalf of the Institute of Physics and Deutsche Physikalische Gesellschaft. Original content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. |
Peer Review: | si |
Publisher version: | https://doi.org/10.1088/1367-2630/ab116b |
Appears in Collections: | INV - Grupo de Nanofísica - Artículos de Revistas |
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