4.6 Article

Emergence of crystalline few-body correlations in mass-imbalanced Fermi polarons

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CELL REPORTS PHYSICAL SCIENCE
卷 3, 期 8, 页码 -

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DOI: 10.1016/j.xcrp.2022.100993

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资金

  1. National Key Research and Development Program of China [2018YFA0307600]
  2. National Natural Science Foundation of China [12074419, 12134015]
  3. Strategic Priority Research Program of Chinese Academy of Sciences [XDB33000000]

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In this study, various crystalline few-body correlations smoothly emerged from mass-imbalanced Fermi polarons in two dimensions were revealed. When the fermion-impurity mass ratio exceeds a certain critical value, the Fermi polaron undergoes a smooth transition from the polaronic to trimer and tetramer regimes.
Polarons can serve as an ideal platform to identify few-body correlations in tackling complex many-body problems. In this work, we reveal various crystalline few-body correlations smoothly emergent from the mass-imbalanced Fermi polarons in two dimensions. A unified variational approach up to three particle-hole excitations allows us to extract the dominant dimer, trimer, or tetramer correlation in a single framework. When the fermion-impurity mass ratio is beyond certain critical value, the Fermi polaron is found to undergo a smooth crossover, instead of a sharp transition, from the polaronic to trimer and tetramer regimes as the fermion-impurity attraction is increased. The emergent trimer and tetramer correlations result in the momentum-space crystallization of particle-hole excitations featuring a stable diagonal or triangular structure, as can be directly probed through the density-density correlation of majority fermions. Our results shed light on the intriguing quantum phases in the mass-imbalanced Fermi-Fermi mixtures beyond the pairing superfluid paradigm.

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