Reentrant Fulde-Ferrell-Larkin-Ovchinnikov superfluidity in the honeycomb lattice

被引：11
作者：
Cichy, Agnieszka [1 ,2 ]
Ptok, Andrzej [3 ]
机构：
[1] Adam Mickiewicz Univ, Fac Phys, Solid State Theory Div, Umultowska 85, PL-61614 Poznan, Poland
[2] Johannes Gutenberg Univ Mainz, Inst Phys, Staudingerweg 9, D-55099 Mainz, Germany
[3] Polish Acad Sci, Inst Nucl Phys, Ulica E Radzikowskiego 152, PL-31342 Krakow, Poland
来源：
PHYSICAL REVIEW A | 2018年 / 97卷 / 05期
关键词：
ELECTRONIC-STRUCTURE; PHASE-TRANSITIONS; CRITICAL FIELD; HUBBARD-MODEL; SUPERCONDUCTIVITY; STATES; SEPARATION; CROSSOVER; DEVICE; SPINS;
D O I：
10.1103/PhysRevA.97.053619
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
We study superconducting properties of population-imbalanced ultracold Fermi mixtures in the honeycomb lattice that can be effectively described by the spin-imbalanced attractive Hubbard model in the presence of a Zeeman magnetic field. We use the mean-field theory approach to obtain ground-state phase diagrams including the unconventional Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) phase, which is characterized by atypical behavior of the Cooper-pair total momentum. We show that the momentum changes its value as well as direction with a change of the system parameters. We discuss the influence of Van Hove singularities on the possibility of the reentrant FFLO phase occurrence, without a BCS precursor.
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页数：11
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