Quantum phase diagram of Rydberg-Dressed Fermi Gases

We systematically investigate the topological superfluidity of a Rydberg-dressed Fermi gas, where the soft-core effective interaction is of finite radius ${R}_{c}$ due to the blockade effect. We calculate the quantum phase diagram within the mean-field approximation and find three distinct phases: polar $({p}_{z})$ , axial $({p}_{x}+i{p}_{y})$ , and axiplanar $({p}_{x}+i{\ensuremath{\beta}}_{p}{p}_{y})$ phases. The tricritical point is around ${R}_{c}{k}_{F}\ensuremath{\sim}1$, where ${k}_{F}$ is the Fermi wave vector. We further derive the Ginzburg--Landau theory to explain the phase diagram and estimate the transition temperature to be about $0.1{E}_{F}$ in the current experimental regime of $^{6}\mathrm{Li}$ . Our work paves the way for future studies on exotic topological superfluids and related quantum phase transitions.We systematically investigate the topological superfluidity of a Rydberg-dressed Fermi gas, where the soft-core effective interaction is of finite radius ${R}_{c}$ due to the blockade effect. We calculate the quantum phase diagram within the mean-field approximation and find three distinct phases: polar $({p}_{z})$, axial $({p}_{x}+i{p}_{y})$, and axiplanar $({p}_{x}+i{\ensuremath{\beta}}_{p}{p}_{y})$ phases. The tricritical point is around ${R}_{c}{k}_{F}\ensuremath{\sim}1$, where ${k}_{F}$ is the Fermi wave vector. We further derive the Ginzburg--Landau theory to explain the phase diagram and estimate the transition temperature to be about $0.1{E}_{F}$ in the current experimental regime of $^{6}\mathrm{Li}$. Our work paves the way for future studies on exotic topological superfluids and related quantum phase transitions.

arXiv:1307.5444Physical Review AJul 30, 201420 citations

A new quantum phase transition in cold atomic Fermi gas

W. Vincent Liu, Frank A. Wilczek, P. Zoller

APSMar 1, 20040 citations

We systematically investigate the topological superfluidity of a Rydberg-dressed Fermi gas, where the soft-core effective interaction is of finite radius

{R}_{c}

due to the blockade effect. We calculate the quantum phase diagram within the mean-field approximation and find three distinct phases: polar

({p}_{z})

, axial

({p}_{x}+i{p}_{y})

, and axiplanar $({p}_{x}+i{\ensuremath{\beta}}_{p}{p}_{y})$ phases. The tricritical point is around ${R}_{c}{k}_{F}\ensuremath{\sim}1$, where

{k}_{F}

is the Fermi wave vector. We further derive the Ginzburg--Landau theory to explain the phase diagram and estimate the transition temperature to be about

0.1{E}_{F}

in the current experimental regime of

^{6}\mathrm{Li}

. Our work paves the way for future studies on exotic topological superfluids and related quantum phase transitions.