Mass-imbalanced two-dimensional Bose-Fermi mixtures with boson-fermion pairing
Abstract
We analyze a two-dimensional Bose-Fermi mixture at zero temperature in the presence of a tunable Bose-Fermi attraction. We adopt a diagrammatic T-matrix approach and study the behavior of several thermodynamic quantities for the two species as functions of density, mass ratio, and coupling strength. These include the chemical potentials, the boson momentum distribution function, the condensate density, and Tan's contact parameter. We analytically demonstrate that the present T-matrix formalism recovers the correct second-order perturbative expansion of the chemical potentials in the weak-coupling regime, and test it numerically. The near-universal behavior of the condensate fraction already found in prior work for the mass-balanced case is confirmed for different masses and becomes even more accurate when the boson mass is large. The mass imbalance emerges as an additional control parameter that qualitatively affects the bosonic momentum distribution. In particular, we found that it can be used to allow for the experimental observation of a peculiar peak in the boson momentum distribution at finite momentum.
Versions
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BibTeX
@misc{chiarappa2026massimbalanced,
title = {{Mass-imbalanced two-dimensional Bose-Fermi mixtures with boson-fermion pairing}},
author = {Cristiano Luigi Kosman Chiarappa and Pietro Bovini and Pierbiagio Pieri},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2606.14338},
eprint = {2606.14338},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2606.14338},
}
RIS
TY - UNPB
TI - Mass-imbalanced two-dimensional Bose-Fermi mixtures with boson-fermion pairing
AU - Cristiano Luigi Kosman Chiarappa
AU - Pietro Bovini
AU - Pierbiagio Pieri
PY - 2026
DA - 2026/10/16
PB - arXiv
DO - 10.48550/arxiv.2606.14338
UR - https://arxiv.org/abs/2606.14338
AB - We analyze a two-dimensional Bose-Fermi mixture at zero temperature in the presence of a tunable Bose-Fermi attraction. We adopt a diagrammatic T-matrix approach and study the behavior of several thermodynamic quantities for the two species as functions of density, mass ratio, and coupling strength. These include the chemical potentials, the boson momentum distribution function, the condensate density, and Tan's contact parameter. We analytically demonstrate that the present T-matrix formalism recovers the correct second-order perturbative expansion of the chemical potentials in the weak-coupling regime, and test it numerically. The near-universal behavior of the condensate fraction already found in prior work for the mass-balanced case is confirmed for different masses and becomes even more accurate when the boson mass is large. The mass imbalance emerges as an additional control parameter that qualitatively affects the bosonic momentum distribution. In particular, we found that it can be used to allow for the experimental observation of a peculiar peak in the boson momentum distribution at finite momentum.
ER -