Publications associated with Condensed Matter Theory

Atypical energy eigenstates in the Hubbard chain and quantum disentangled liquids.

Philosophical transactions. Series A, Mathematical, physical, and engineering sciences 375 (2017)

T Veness, FHL Essler, MPA Fisher

We investigate the implications of integrability for the existence of quantum disentangled liquid (QDL) states in the half-filled one-dimensional Hubbard model. We argue that there exist finite energy-density eigenstates that exhibit QDL behaviour in the sense of Grover & Fisher (2014 J. Stat. Mech.2014, P10010. (doi:10.1088/1742-5468/2014/10/P10010)). These states are atypical in the sense that their entropy density is smaller than that of thermal states at the same energy density. Furthermore, we show that thermal states in a particular temperature window exhibit a weaker form of the QDL property, in agreement with recent results obtained by strong-coupling expansion methods in Veness et al. (2016 ( article is part of the themed issue 'Breakdown of ergodicity in quantum systems: from solids to synthetic matter'.

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