Finite-range effects in the unitary Fermi polaron

Autor(es)

Pessoa, Renato ^[1] ; Vitiello, S. A. ^[2] ; Ardila, L. A. Pena ^[3]

Afiliação do(s) autor(es)

^[1] Univ Fed Goicis UFG, Inst Fis, BR-74001970 Goiania, Go - Brazil

^[2] Univ Estadual Campinas, UNICAMP, Inst Fis Gleb Wataghin, BR-13083970 Campinas, SP - Brazil

^[3] Leibniz Univ Hannover, Inst Theoret Phys, D-30167 Hannover - Germany

• Tipo de documento: Artigo Científico
• Fonte: Physical Review A; v. 104, n. 4 OCT 19 2021.
• Citações Web of Science: 0

Resumo

Quantum Monte Carlo techniques are employed to study the properties of polarons in an ultracold Fermi gas, at T = 0, and in the unitary regime using both a zero-range model and a square-well potential. For a fixed density, the potential range is varied and results are extrapolated and compared against a zero-range model. A discussion regarding the choice of an interacting potential with a finite range is presented. We compute the polaron effective mass, the polaron binding energy, and the effective coupling between them. The latter is obtained using the Landau-Pomeranchuk's weakly interacting quasiparticle model. The contact parameter is estimated by fitting the pair distribution function of atoms in different spin states. (AU)

• Processo FAPESP: 16/17612-7 - Dinâmica de sistemas de muitos corpos IV
• Beneficiário: Arnaldo Gammal
• Modalidade de apoio: Auxílio à Pesquisa - Temático