Logarithmic current fluctuations in non-equilibrium quantum spin chains

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dc.creatorAntal, Tibor
dc.creatorKrapivsky, P. L.
dc.creatorRákos, A.
dc.date2008-08-26
dc.date2009-01-09
dc.date.accessioned2026-07-07T12:27:29Z
dc.date.available2026-07-07T12:27:29Z
dc.descriptionWe study zero-temperature quantum spin chains which are characterized by a non-vanishing current. For the XX model starting from the initial state |... + + + - - - ...> we derive an exact expression for the variance of the total spin current. We show that asymptotically the variance exhibits an anomalously slow logarithmic growth; we also extract the sub-leading constant term. We then argue that the logarithmic growth remains valid for the XXZ model in the critical region.
dc.description9 pages, 4 figures, minor alterations
dc.identifierhttps://arxiv.org/abs/0808.3514
dc.identifierhttp://arxiv.org/abs/0808.3514
dc.identifierPhysical Review E 78, 061115 (2008)
dc.identifierdoi:10.1103/PhysRevE.78.061115
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/215225
dc.subjectStatistical Mechanics
dc.subjectStrongly Correlated Electrons
dc.titleLogarithmic current fluctuations in non-equilibrium quantum spin chains
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