Universal tetramer and pentamer in two-dimensional fermionic mixtures

Abstract

We study the emergence of universal tetramer and pentamer bound states in the two-dimensional $(N+1)$ system, which consists of $N$ identical heavy fermions interacting with a light atom. We show that the critical heavy-light mass ratio to support a ($3+1$) tetramer below the trimer threshold is $3.38$, and to support a ($4+1$) pentamer below the tetramer threshold is $5.14$. While these ground state tetramer and pentamer are both with zero total angular momentum, they exhibit very different density distributions and correlations in momentum space, due to their distinct angular momentum decompositions in the dimer-fermion frame. These universal bound states can be accessible by a number of Fermi-Fermi mixtures now realized in cold atoms laboratories, which also suggest novel few-body correlations dominant in their corresponding many-body systems.

6 pages, 3 figures; version to appear in PRL

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Cited by in corpus (11)

• Quantum mixtures of ultracold gases of neutral atoms
• Quartet Superfluid in Two-dimensional Mass-imbalanced Fermi Mixtures
• Ultracold LiCr: a new pathway to quantum gases of paramagnetic polar molecules
• Double-degenerate Fermi mixtures of ${}^6$Li and ${}^{53}$Cr atoms
• Competing few-body correlations in ultracold Fermi polarons
• Impurity-induced pairing in two-dimensional Fermi gases
• Stability of $(N+1)$-body fermion clusters in multiband Hubbard model
• Self-binding of one-dimensional fermionic mixtures with zero-range interspecies attraction
• Universal clusters in quasi-two-dimensional ultracold Fermi mixtures
• Heavy-light $N+1$ clusters of two-dimensional fermions
• Absence of binding of heavy fermions by two light atoms in two dimensions