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arXiv · 1504.02864

Orbital Feshbach Resonance in Alkali-Earth Atoms

Ren Zhang·Yanting Cheng·Hui Zhai·Peng Zhang
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Abstract

For a mixture of alkali-earth atomic gas in the long-lived excited state ${}^3P_0$ and ground state ${}^1S_0$, in addition to nuclear spin, another "orbital" index is introduced to distinguish these two internal states. In this letter we propose a mechanism to induce Feshbach resonance between two atoms with different orbital and nuclear spin quantum numbers. Two essential ingredients are inter-orbital spin-exchanging scattering and orbital dependence of the Land\'e g-factors. Here the orbital degrees of freedom plays similar role as electron spin degree of freedom in magnetic Feshbach resonance in alkali-metal atoms. This resonance is particularly accessible for ${}^{173}$Yb system. The BCS-BEC crossover in this system requires two fermion pairing order parameters, and displays significant difference comparing to that in alkali-metal system.

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Ren Zhang, Yanting Cheng, Hui Zhai, Peng Zhang. 2015-04-11. Orbital Feshbach Resonance in Alkali-Earth Atoms. https://doi.org/10.1103/physrevlett.115.135301

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