Boson-fermion pairing and condensation in two-dimensional Bose-Fermi mixtures
We consider a mixture of bosons and spin-polarized fermions in two dimensions at zero temperature with a tunable Bose-Fermi attraction. By adopting a diagrammatic $T$-matrix approach, we analyze the behavior of several thermodynamic quantities for the two species as a function of the density ratio a...
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2025-03-01
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| Series: | SciPost Physics |
| Online Access: | https://scipost.org/SciPostPhys.18.3.076 |
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| author | Leonardo Pisani, Pietro Bovini, Fabrizio Pavan, Pierbiagio Pieri |
| author_facet | Leonardo Pisani, Pietro Bovini, Fabrizio Pavan, Pierbiagio Pieri |
| author_sort | Leonardo Pisani, Pietro Bovini, Fabrizio Pavan, Pierbiagio Pieri |
| collection | DOAJ |
| description | We consider a mixture of bosons and spin-polarized fermions in two dimensions at zero temperature with a tunable Bose-Fermi attraction. By adopting a diagrammatic $T$-matrix approach, we analyze the behavior of several thermodynamic quantities for the two species as a function of the density ratio and coupling strength, including the chemical potentials, the momentum distribution functions, the boson condensate density, and the Tan's contact parameter. By increasing the Bose-Fermi attraction, we find that the condensate is progressively depleted and Bose-Fermi pairs form, with a small fraction of condensed bosons surviving even for strong Bose-Fermi attraction. This small condensate proves sufficient to hybridize molecular and atomic states, producing quasi-particles with unusual Fermi liquid features. A nearly universal behavior of the condensate fraction, the bosonic momentum distribution, and Tan's contact parameter with respect to the density ratio is also found. |
| format | Article |
| id | doaj-art-99c92d9bc64e4c3eb89f62ec14c6e540 |
| institution | OA Journals |
| issn | 2542-4653 |
| language | English |
| publishDate | 2025-03-01 |
| publisher | SciPost |
| record_format | Article |
| series | SciPost Physics |
| spelling | doaj-art-99c92d9bc64e4c3eb89f62ec14c6e5402025-08-20T02:17:47ZengSciPostSciPost Physics2542-46532025-03-0118307610.21468/SciPostPhys.18.3.076Boson-fermion pairing and condensation in two-dimensional Bose-Fermi mixturesLeonardo Pisani, Pietro Bovini, Fabrizio Pavan, Pierbiagio PieriWe consider a mixture of bosons and spin-polarized fermions in two dimensions at zero temperature with a tunable Bose-Fermi attraction. By adopting a diagrammatic $T$-matrix approach, we analyze the behavior of several thermodynamic quantities for the two species as a function of the density ratio and coupling strength, including the chemical potentials, the momentum distribution functions, the boson condensate density, and the Tan's contact parameter. By increasing the Bose-Fermi attraction, we find that the condensate is progressively depleted and Bose-Fermi pairs form, with a small fraction of condensed bosons surviving even for strong Bose-Fermi attraction. This small condensate proves sufficient to hybridize molecular and atomic states, producing quasi-particles with unusual Fermi liquid features. A nearly universal behavior of the condensate fraction, the bosonic momentum distribution, and Tan's contact parameter with respect to the density ratio is also found.https://scipost.org/SciPostPhys.18.3.076 |
| spellingShingle | Leonardo Pisani, Pietro Bovini, Fabrizio Pavan, Pierbiagio Pieri Boson-fermion pairing and condensation in two-dimensional Bose-Fermi mixtures SciPost Physics |
| title | Boson-fermion pairing and condensation in two-dimensional Bose-Fermi mixtures |
| title_full | Boson-fermion pairing and condensation in two-dimensional Bose-Fermi mixtures |
| title_fullStr | Boson-fermion pairing and condensation in two-dimensional Bose-Fermi mixtures |
| title_full_unstemmed | Boson-fermion pairing and condensation in two-dimensional Bose-Fermi mixtures |
| title_short | Boson-fermion pairing and condensation in two-dimensional Bose-Fermi mixtures |
| title_sort | boson fermion pairing and condensation in two dimensional bose fermi mixtures |
| url | https://scipost.org/SciPostPhys.18.3.076 |
| work_keys_str_mv | AT leonardopisanipietrobovinifabriziopavanpierbiagiopieri bosonfermionpairingandcondensationintwodimensionalbosefermimixtures |