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arXiv · cond-mat/9807324

Multi-connected Momentum Distribution and Fermion Condensation

M. V. Zverev·M. Baldo
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Abstract

The structure of the ground state beyond the instability point of the quasiparticle system with Fermi-step momentum distribution is studied within the model of a Fermi liquid with a strong repulsive interaction. A ground state rearrangement occurs as the interaction strength is increased beyond a definite critical value. Numerical investigation of the initial stage of this structural transition shows that there are two temperature regions, corresponding to different scenarios of the rearrangement. While for temperature T larger than some characteristic temperature T_0 the behaviour of the system is the same as that in the case of the fermion condensation, for T<T_0 the intermediate structure with multi-connected quasiparticle momentum distribution arises. The transition of this structure to the fermion condensate at increasing interaction strength is discussed.

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M. V. Zverev, M. Baldo. 1998-07-24. Multi-connected Momentum Distribution and Fermion Condensation. https://doi.org/10.1088/0953-8984%2F11%2F9%2F004

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