Critical Zeeman Splitting of Fermi Superfluidity at Infinite Scattering Length

Details Critical Zeeman Splitting of Fermi Superfluidity at Infinite Scattering Length Critical Zeeman Splitting of Fermi Superfluidity at Infinite Scattering Length

2008-03-28

arxiv.org/abs/0803.4052v2

Physics

Condensed Matter

Superconductivity

Version updated, 4.1 pages, title changed

Scientific paper

We determine the critical Zeeman energy splitting for Fermi superfluidity at infinite s-wave scattering length according to the Monte Carlo and experimental results of the equations of state. Based on the universality hypothesis, we show that there exist two critical fields $H_{c1}$ and $H_{c2}$, between which a superfluid-normal mixed phase is energetically favored, and model-independent formulae for $H_{c1}$, $H_{c2}$ and the critical population imbalance $P_c$ are derived. Using recent Monte Carlo and experimental results of $P_c$, $H_{c1}$ and $H_{c2}$ are determined. It is found $H_{c1}=0.41\epsilon_{\text F}$ and $H_{c2}=0.50\epsilon_{\text F}$, with $\epsilon_{\text F}$ being the Fermi energy of non-interacting gas.

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