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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Random SU(2)-symmetric spin-S chains

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Quito, V. L. ; Hoyos, Jose A. ; Miranda, E.
Total Authors: 3
Document type: Journal article
Source: Physical Review B; v. 94, n. 6 AUG 3 2016.
Web of Science Citations: 1

We study the low-energy physics of a broad class of time-reversal invariant and SU(2)-symmetric one-dimensional spin-S systems in the presence of quenched disorder via a strong-disorder renormalization-group technique. We show that, in general, there is an antiferromagnetic phase with an emergent SU(2S + 1) symmetry. The ground state of this phase is a random singlet state in which the singlets are formed by pairs of spins. For integer spins, there is an additional antiferromagnetic phase which does not exhibit any emergent symmetry (except for S = 1). The corresponding ground state is a random singlet one but the singlets are formed mostly by trios of spins. In each case the corresponding low-energy dynamics is activated, i.e., with a formally infinite dynamical exponent, and related to distinct infinite-randomness fixed points. The phase diagram has two other phases with ferromagnetic tendencies: a disordered ferromagnetic phase and a large spin phase in which the effective disorder is asymptotically finite. In the latter case, the dynamical scaling is governed by a conventional power law with a finite dynamical exponent. (AU)

FAPESP's process: 07/57630-5 - Non-perturbative methods applied to strongly correlated electronic systems
Grantee:Eduardo Miranda
Support type: Research Projects - Thematic Grants
FAPESP's process: 15/23849-7 - Quantum spin chains
Grantee:Francisco Castilho Alcaraz
Support type: Research Projects - Thematic Grants
FAPESP's process: 09/17531-3 - Studies of strongly disordered quantum systems
Grantee:Victor Luiz Quito
Support type: Scholarships in Brazil - Doctorate (Direct)