一维多组分超冷费米子中的三子相和四子相
Trionic and quartetting phases in one-dimensional multicomponent ultracold fermions
摘要：
我们调查的可能形成的分子凝聚，这可能是，例如，类似物的α凝聚的核物理，在多组分冷原子费米子系统的背景下。用低能和数值方法研究了一维光晶格中N分量费米子的一个简单的具有接触相互作用的范型模型。对于吸引相互作用，准长程分子超流相，由N费米子的束缚态形成，在低密度下出现。我们表明，三阶和四阶相位，分别为N= 3，4，扩展在一个大的域的相图，并对小的破坏性扰动是强大的。
英文摘要：
We investigate the possible formation of a molecular condensate, which might be, for instance, the analogue of the alpha condensate of nuclear physics, in the context of multicomponent cold atoms fermionic systems. A simple paradigmatic model of N-component fermions with contact interactions loaded into a one-dimensional optical lattice is studied by means of low-energy and numerical approaches. For attractive interaction, a quasi-long-range molecular superfluid phase, formed from bound-states made of N fermions, emerges at low density. We show that trionic and quartetting phases, respectively for N=3,4, extend in a large domain of the phase diagram and are robust against small symmetry-breaking perturbations.
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