Quantum critical states and phase transitions in the presence of non-equilibrium noise

Dalla Torre, Emanuele G.; Demler, Eugene; Giamarchi, Thierry; Altman, Ehud

doi:10.1038/nphys1754

Scientific article

English

Quantum critical states and phase transitions in the presence of non-equilibrium noise

Contributors

Dalla Torre, Emanuele G.; Demler, Eugene; Giamarchi, Thierry; Altman, Ehud

Published in

Nature physics, vol. 6, no. 10, p. 806-810

Publication date

2010

Abstract

Quantum critical points are characterized by scale-invariant correlations and therefore by long-range entanglement. As such, they present fascinating examples of quantum states of matter and their study is an important theme in modern physics. However, little is known about the fate of quantum criticality under non-equilibrium conditions. Here we investigate the effect of external noise sources on quantum critical points. It is natural to expect that noise will have a similar effect to finite temperature, that is, destroying the subtle correlations underlying the quantum critical behaviour. Surprisingly, we find that the ubiquitous 1/f noise does preserve the critical correlations. The emergent states show an intriguing interplay of intrinsic quantum critical and external-noise-driven fluctuations. We illustrate this general phenomenon with specific examples describing solid-state and ultracold-atoms systems. Moreover, our approach shows that genuine quantum phase transitions can exist even under non-equilibrium conditions.

UNIGE affiliation entities

Faculté des sciences / Section de physique / Département de physique de la matière quantique

UNIGE research groups

Groupe Giamarchi

Citation (ISO format)

DALLA TORRE, Emanuele G. et al. Quantum critical states and phase transitions in the presence of non-equilibrium noise. In: Nature physics, 2010, vol. 6, n° 10, p. 806–810. doi: 10.1038/nphys1754

Article (Published version)

Identifiers

PID : unige:36010
DOI : 10.1038/nphys1754

Journal ISSN

1745-2473

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Quantum critical states and phase transitions in the presence of non-equilibrium noise

Contributors

Published in

Publication date

Abstract

UNIGE affiliation entities

UNIGE research groups

Citation (ISO format)

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Journal ISSN

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Creation

First validation

Update

Status update

Last indexation