Lattice Polarons across the Superfluid to Mott Insulator Transition

Anno: 2023

Autori: Colussi VE., Caleffi F., Menotti C., Recati A.

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

Abstract: We study the physics of a mobile impurity confined in a two-dimensional lattice, moving within a Bose -Hubbard bath at zero temperature. Exploiting the quantum Gutzwiller formalism, we develop a beyond-Frohlich model of the bath-impurity interaction to describe the properties of the polaronic quasiparticle formed by the dressing of the impurity by quantum fluctuations of the bath. We find a stable and well-defined polaron throughout the entire phase diagram of the bath, except for the very low tunneling limit of the hard-core superfluid. The polaron properties are highly sensitive to the different universality classes of the quantum phase transition between the superfluid and Mott insulating phases, providing an unambiguous probe of correlations and collective modes in a quantum critical many-body environment.

Giornale/Rivista: PHYSICAL REVIEW LETTERS

Volume: 130 (17)      Da Pagina: 173002-1  A: 173002-6

Maggiori informazioni: We thank Georg M. Bruun, Ragheed Alhyder, and Stefano Giorgini for fruitful discussions and constructive feedback. This project has received financial support from Provincia Autonoma di Trento and the Italian MIUR through the PRIN2017 project CEnTraL (Protocol No. 20172H2SC4) .
Parole chiavi: Quantum Simulations; Spectral-function; Atoms; Model; Hole; Impurity; State
DOI: 10.1103/PhysRevLett.130.173002

Citazioni: 9
dati da “WEB OF SCIENCE” (of Thomson Reuters) aggiornati al: 2024-11-17
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