Odd-parity topological superfluidity for fermions in a bond-centered square optical lattice

Xu, Zhi-Fang1,2,3; Hemmerich, Andreas4; Liu, W. Vincent5,6,7

2017-11-06

10.1103/PhysRevA.96.053607

PHYSICAL REVIEW A   影响因子和分区

2469-9926

2469-9934

We propose a physical scheme for the realization of two-dimensional topological odd-parity superfluidity in a spin-independent bond-centered square optical lattice based upon interband fermion pairing. The D-4 point-group symmetry of the lattice protects a quadratic band crossing, which allows one to prepare a Fermi surface of spin-up fermions with odd parity close to the degeneracy point. In the presence of spin-down fermions with even parity populating a different energetically well-separated band, odd-parity pairing is favored. Strikingly, as a necessary prerequisite for pairing, both Fermi surfaces can be tuned to match well. As a result, topological superfluid phases emerge in the presence of merely s-wave interaction. Due to the Z(2) symmetry of these odd-parity superfluids, we infer their topological features simply from the symmetry and the Fermi-surface topology as confirmed numerically.

SCI ; EI

英语

第一 ; 通讯

DFG[SFB925]

Optics ; Physics

Optics ; Physics, Atomic, Molecular & Chemical

WOS:000414395000006

AMER PHYSICAL SOC

20174604401115

Crystal lattices ; Fermi surface ; Optical materials ; Shear waves ; Topology

Optical Devices and Systems:741.3 ; Laser Beam Interactions:744.8 ; Combinatorial Mathematics, Includes Graph Theory, Set Theory:921.4 ; Mechanics:931.1 ; Atomic and Molecular Physics:931.3 ; Crystal Lattice:933.1.1

PHYSICS

Web of Science

1.Southern Univ Sci & Technol, Inst Quantum Sci & Engn, Shenzhen 518055, Peoples R China
2.Southern Univ Sci & Technol, Dept Phys, Shenzhen 518055, Peoples R China
3.Huazhong Univ Sci & Technol, MOE Key Lab Fundamental Phys Quant Measurements, Sch Phys, Wuhan 430074, Hubei, Peoples R China
4.Univ Hamburg, Inst Laser Phys, Luruper Chaussee 149, D-22761 Hamburg, Germany
5.Shanghai Jiao Tong Univ, Wilczek Quantum Ctr, Sch Phys & Astron, Shanghai 200240, Peoples R China
6.Shanghai Jiao Tong Univ, TD Lee Inst, Shanghai 200240, Peoples R China
7.Univ Pittsburgh, Dept Phys & Astron, Pittsburgh, PA 15260 USA

Xu, Zhi-Fang,Hemmerich, Andreas,Liu, W. Vincent. Odd-parity topological superfluidity for fermions in a bond-centered square optical lattice[J]. PHYSICAL REVIEW A,2017,96(5).

Xu, Zhi-Fang,Hemmerich, Andreas,&Liu, W. Vincent.(2017).Odd-parity topological superfluidity for fermions in a bond-centered square optical lattice.PHYSICAL REVIEW A,96(5).

Xu, Zhi-Fang,et al."Odd-parity topological superfluidity for fermions in a bond-centered square optical lattice".PHYSICAL REVIEW A 96.5(2017).