PittsburghV1, Main, Exploration, bibRecord, 001923

Proposed formation and dynamical signature of a chiral Bose liquid in an optical lattice.

Identifieur interne : 001923 ( Main/Exploration ); précédent : 001922; suivant : 001924

Proposed formation and dynamical signature of a chiral Bose liquid in an optical lattice.

Auteurs : Xiaopeng Li [États-Unis] ; Arun Paramekanti [Canada] ; Andreas Hemmerich [Allemagne] ; W Vincent Liu [République populaire de Chine]

Source :

Nature communications [ 2041-1723 ] ; 2014.

RBID : pubmed:24492473

Abstract

Recent experiments on p-orbital atomic bosons have suggested the emergence of a spectacular ultracold superfluid with staggered orbital currents in optical lattices. This raises fundamental questions concerning the effects of thermal fluctuations as well as possible ways of directly observing such chiral order. Here we show via Monte Carlo simulations that thermal fluctuations destroy this superfluid in an unexpected two-step process, unveiling an intermediate normal phase with spontaneously broken time-reversal symmetry, dubbed a 'chiral Bose liquid'. For integer fillings (n≥2) in the chiral Mott regime, thermal fluctuations are captured by an effective orbital Ising model, and Onsager's powerful exact solution is adopted to determine the transition from this intermediate liquid to the para-orbital normal phase at high temperature. A lattice quench is designed to convert the staggered angular momentum, previously thought by experts difficult to directly probe, into coherent orbital oscillations, providing a time-resolved dynamical signature of chiral order.

DOI: 10.1038/ncomms4205
PubMed: 24492473

Affiliations:

Le document en format XML

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<front><div type="abstract" xml:lang="en">Recent experiments on p-orbital atomic bosons have suggested the emergence of a spectacular ultracold superfluid with staggered orbital currents in optical lattices. This raises fundamental questions concerning the effects of thermal fluctuations as well as possible ways of directly observing such chiral order. Here we show via Monte Carlo simulations that thermal fluctuations destroy this superfluid in an unexpected two-step process, unveiling an intermediate normal phase with spontaneously broken time-reversal symmetry, dubbed a 'chiral Bose liquid'. For integer fillings (n≥2) in the chiral Mott regime, thermal fluctuations are captured by an effective orbital Ising model, and Onsager's powerful exact solution is adopted to determine the transition from this intermediate liquid to the para-orbital normal phase at high temperature. A lattice quench is designed to convert the staggered angular momentum, previously thought by experts difficult to directly probe, into coherent orbital oscillations, providing a time-resolved dynamical signature of chiral order.</div>
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Proposed formation and dynamical signature of a chiral Bose liquid in an optical lattice.

Proposed formation and dynamical signature of a chiral Bose liquid in an optical lattice.

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