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arXiv · 2210.07042

Competition between pairing and tripling in one-dimensional fermions with coexistent s- and p-wave interactions

Yixin Guo·Hiroyuki Tajima
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Abstract

We theoretically investigate in-medium two- and three-body correlations in one-dimensional two-component Fermi gases with coexistent even-parity s-wave and odd-parity p-wave interactions. We find the solutions of the stable in-medium three-body cluster states such as Cooper triple by solving the corresponding in-medium variational equations. We further feature the phase diagram consisting of the s- and p-wave Cooper pairing phase, and Cooper tripling phase, in the plane of s- and p-wave pairing strengths. The Cooper tripling phase dominates over the pairing phases when both s- and p-wave interactions are moderately strong.

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Yixin Guo, Hiroyuki Tajima. 2022-10-13. Competition between pairing and tripling in one-dimensional fermions with coexistent s- and p-wave interactions. https://doi.org/10.1103/physrevb.107.024511

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