Rounding of a first-order quantum phase transition to a strong-coupling critical point
| Contribuinte(s) |
UNIVERSIDADE DE SÃO PAULO |
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| Data(s) |
04/11/2013
04/11/2013
2012
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| Resumo |
We investigate the effects of quenched disorder on first-order quantum phase transitions on the example of the N-color quantum Ashkin-Teller model. By means of a strong-disorder renormalization group, we demonstrate that quenched disorder rounds the first-order quantum phase transition to a continuous one for both weak and strong coupling between the colors. In the strong-coupling case, we find a distinct type of infinite-randomness critical point characterized by additional internal degrees of freedom. We investigate its critical properties in detail and find stronger thermodynamic singularities than in the random transverse field Ising chain. We also discuss the implications for higher spatial dimensions as well as unusual aspects of our renormalization-group scheme. DOI: 10.1103/PhysRevB.86.214204 NSF NSF [DMR-0906566, DMR-1205803] FAPESP [2010/03749-4] FAPESP CNPq [590093/2011-8, 302301/2009-7] CNPq |
| Identificador |
PHYSICAL REVIEW B, COLLEGE PK, v. 86, n. 21, supl. 1, Part 6, pp. 886-893, DEC 10, 2012 1098-0121 http://www.producao.usp.br/handle/BDPI/37965 10.1103/PhysRevB.86.214204 |
| Idioma(s) |
eng |
| Publicador |
AMER PHYSICAL SOC COLLEGE PK |
| Relação |
PHYSICAL REVIEW B |
| Direitos |
openAccess Copyright AMER PHYSICAL SOC |
| Palavras-Chave | #ASHKIN-TELLER MODEL #ISING SPIN CHAINS #LARGE-N LIMIT #SYSTEMS #DISORDER #PHYSICS, CONDENSED MATTER |
| Tipo |
article original article publishedVersion |
