Kavli Affiliate: Cheng Peng
| First 5 Authors: Ruijin Liu, Cheng Peng, Xiaoling Cui, ,
| Summary:
We study the emergence of universal tetramer and pentamer bound states in the
two-dimensional $(N+1)$ system, which consists $N$ 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 tetramer 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.
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