Quantum Gutzwiller approach for the two-component Bose-Hubbard model

Anno: 2022

Autori: Colussi V.E.; Caleffi F.; Menotti C.; Recati A.

Affiliazione autori: Univ Trento, INO CNR BEC Ctr, Via Sommar 14, Povo, Trento, Italy; Int Sch Adv Studies SISSA, Via Bonomea 265, I-34136 Trieste, Italy; Ist Nazl Fis Nucl, Trento Inst Fundamental Phys & Applicat, Via Sommar 14, I-38123 Povo, Trento, Italy.

Abstract: We study the effects of quantum fluctuations in the two-component Bose-Hubbard model generalizing to mixtures the quantum Gutzwiller approach introduced recently in [Phys. Rev. Research 2, 033276 (2020)]. As a basis for our study, we analyze the mean-field ground-state phase diagram and spectrum of elementary excitations, with particular emphasis on the quantum phase transitions of the model. Within the quantum critical regimes, we address both the superfluid transport properties and the linear response dynamics to density and spin probes of direct experimental relevance. Crucially, we find that quantum fluctuations have a dramatic effect on the drag between the superfluid species of the system, particularly in the vicinity of the paired and antipaired phases absent in the usual one-component Bose-Hubbard model. Additionally, we analyse the contributions of quantum corrections to the one-body coherence and density/spin fluctuations from the perspective of the collective modes of the system, providing results for the few-body correlations in all the regimes of the phase diagram.

Giornale/Rivista: SCIPOST PHYSICS

Volume: 12 (3)      Da Pagina: 111-1  A: 111-53

Maggiori informazioni: This project has received financial support from Provincia Autonoma di Trento and the Italian MIUR through the PRIN2017 project CEnTraL (Protocol Number 20172H2SC4).
Parole chiavi: mott insulator; superfluid; atoms; metal; gas
DOI: 10.21468/SciPostPhys.12.3.111

Citazioni: 11
dati da “WEB OF SCIENCE” (of Thomson Reuters) aggiornati al: 2025-05-04
Riferimenti tratti da Isi Web of Knowledge: (solo abbonati)
Link per visualizzare la scheda su IsiWeb: Clicca qui
Link per visualizzare la citazioni su IsiWeb: Clicca qui