Percolation transition in quantum Ising and rotor models with sub-Ohmic dissipation
| Contribuinte(s) |
UNIVERSIDADE DE SÃO PAULO |
|---|---|
| Data(s) |
30/10/2013
30/10/2013
02/08/2013
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| Resumo |
We investigate the influence of sub-Ohmic dissipation on randomly diluted quantum Ising and rotor models. The dissipation causes the quantum dynamics of sufficiently large percolation clusters to freeze completely. As a result, the zero-temperature quantum phase transition across the lattice percolation threshold separates an unusual super-paramagnetic cluster phase from an inhomogeneous ferromagnetic phase. We determine the low-temperature thermodynamic behavior in both phases, which is dominated by large frozen and slowly fluctuating percolation clusters. We relate our results to the smeared transition scenario for disordered quantum phase transitions, and we compare the cases of sub-Ohmic, Ohmic, and super-Ohmic dissipation. NSF NSF [DMR-0906566] FAPESP [2010/03749-4] FAPESP CNPq [590093/2011-8, 302301/2009-7] CNPq |
| Identificador |
PHYSICAL REVIEW B, COLLEGE PK, v. 86, n. 7, supl. 1, Part 6, pp. E29-E34, AUG 13, 2012 1098-0121 http://www.producao.usp.br/handle/BDPI/36766 10.1103/PhysRevB.86.075119 |
| Idioma(s) |
eng |
| Publicador |
AMER PHYSICAL SOC COLLEGE PK |
| Relação |
PHYSICAL REVIEW B |
| Direitos |
openAccess Copyright AMER PHYSICAL SOC |
| Palavras-Chave | #LONG-RANGE INTERACTIONS #PHASE-TRANSITIONS #SPIN CHAINS #FIELD #BEHAVIOR #REVERSAL #PHYSICS, CONDENSED MATTER |
| Tipo |
article original article publishedVersion |
