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BCS-BEC crossover and quantum phase transition in an ultracold Fermi gas under spin-orbit coupling
WU Fan 1,ZHANG Ren 2,DENG Tianshu 3,ZHANG Wei 4,YI　Wei 5 * #,GUO Guangcan 5
1. Key Laboratory of Quantum Information, University of Science and Technology of China
2.Department of Physics, Renmin University of China, Beijing 100872, People's Republic of China
3.Key Laboratory of Quantum Information, University of Science and Technology of China
4.Department of Physics, Renmin University of China, Beijing 100872, People\'s Republic of China；Beijing Key Laboratory of Opto-electronic Functional Materials & Micro-nano Devices
5.Key Laboratory of Quantum Information, University of Science and Technology of China；Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
*Correspondence author
#Submitted by
Subject:
Funding: none
Opened online:28 March 2014
Accepted by: none
Citation: WU Fan,ZHANG Ren,DENG Tianshu.BCS-BEC crossover and quantum phase transition in an ultracold Fermi gas under spin-orbit coupling[OL]. [28 March 2014] http://en.paper.edu.cn/en_releasepaper/content/4591065
 
 
In this work, we study the BCS-BEC crossover and quantum phase transitions in a Fermi gas under Rashba spin-orbit coupling close to a Feshbach resonance. By adopting a two-channel model, we take into account of the closed channel molecules, and show that combined with spin-orbit coupling, a finite background scattering in the open channel can lead to two branches of solution for both the two-body and the many-body ground states. The branching of the two-body bound state solutions originate from the avoided crossing between bound states from the open and the closed channels, respectively. Unlike the case without spin-orbit coupling, we identify a quantum phase transition in the upper branch regardless of the sign of the background scattering length. For systems with negative background scattering length in particular, we show that the bound state in the open channel, and hence the quantum phase transition in the upper branch, are induced by spin-orbit coupling. ?????
Keywords:ultracold atoms;spin-orbit coupling;quantum simulation
 
 
 

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