Polaron-Depleton Transition in the Yrast Excitations of a One-Dimensional Bose Gas with a Mobile Impurity

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dc.citation.issue1
dc.citation.volume7
dc.contributor.authorYang M
dc.contributor.authorČufar M
dc.contributor.authorPahl E
dc.contributor.authorBrand J
dc.date.accessioned2023-11-29T20:44:22Z
dc.date.accessioned2024-07-25T06:46:50Z
dc.date.available2023-11-29T20:44:22Z
dc.date.available2024-07-25T06:46:50Z
dc.date.issued2022-03-01
dc.description.abstractWe present exact numerical data for the lowest-energy momentum eigenstates (yrast states) of a repulsive spin impurity in a one-dimensional Bose gas using full configuration interaction quantum Monte Carlo (FCIQMC). As a stochastic extension of exact diagonalization, it is well suited for the study of yrast states of a lattice-renormalized model for a quantum gas. Yrast states carry valuable information about the dynamic properties of slow-moving mobile impurities immersed in a many-body system. Based on the energies and the first and second-order correlation functions of yrast states, we identify different dynamical regimes and the transitions between them: The polaron regime, where the impurity’s motion is affected by the Bose gas through a renormalized effective mass; a regime of a gray soliton that is weakly correlated with a stationary impurity, and the depleton regime, where the impurity occupies a dark or gray soliton. Extracting the depleton effective mass reveals a super heavy regime where the magnitude of the (negative) depleton mass exceeds the mass of the finite Bose gas.
dc.identifier.citationYang M, Čufar M, Pahl E, Brand J. (2022). Polaron-Depleton Transition in the Yrast Excitations of a One-Dimensional Bose Gas with a Mobile Impurity. Condensed Matter. 7. 1.
dc.identifier.doi10.3390/condmat7010015
dc.identifier.eissn2410-3896
dc.identifier.elements-typejournal-article
dc.identifier.urihttps://mro.massey.ac.nz/handle/10179/70856
dc.publisherMDPI (Basel, Switzerland)
dc.relation.isPartOfCondensed Matter
dc.rights(c) 2022 The Author/s
dc.rightsCC BY
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.titlePolaron-Depleton Transition in the Yrast Excitations of a One-Dimensional Bose Gas with a Mobile Impurity
dc.typeJournal article
pubs.elements-id451241
pubs.organisational-groupOther
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