Topological superfluid of s -wave-interacting fermions by engineered orbital hybridization in an optical lattice

Arzamasovs，Maksims1; Li，Shuai1; Han，Shuqi1; Liu，W. Vincent2,3; Liu，Bo1

2023-03-01

10.1103/PhysRevA.107.033309

Physical Review A   Impact Factor & Quartile

2469-9926

2469-9934

Recent advanced experimental implementations of optical lattices with highly tunable geometry open up new regimes for exploring quantum many-body states of matter that had not been accessible previously. Here we report that a topological fermionic superfluid with higher Chern number emerges spontaneously from s-wave spin-singlet pairing in an orbital optical lattice when its geometry is tuned to explicitly break reflection symmetry. Qualitatively distinct from the conventional scheme that relies on higher partial-wave pairing, the crucial ingredient of our model is topology originating from mixing higher Wannier orbitals. It leads to unexpected changes in the topological band structure at the single-particle level, i.e., the bands are transformed from possessing two flux-π Dirac points into a single quadratic touching point with flux 2π. Based on such engineered single-particle bands, spin-singlet pairing of ultracold fermions arising from standard s-wave attractive interaction is found to induce higher Chern number (Chern number of 2) and topologically protected chiral edge modes, all occurring at a higher critical temperatures in relative scales, potentially circumventing one of the major obstacle for its realization in ultracold gases.

SCI

English

Others

National Key R&D Program of China[2021YFA1401700] ; NSFC["12074305","12147137","11774282"] ; National Key Research and Development Program of China[2018YFA0307600] ; AFOSR[FA9550-16-1-0006] ; MURI-ARO[W911NF17-1-0323] ; Shanghai Municipal Science and Technology Major Project through the Shanghai Research Center for Quantum Sciences[2019SHZDZX01]

Optics ; Physics

Optics ; Physics, Atomic, Molecular & Chemical

WOS:000957640000012

AMER PHYSICAL SOC

2-s2.0-85151149510

Scopus

1.Ministry of Education Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter,Shaanxi Province Key Laboratory of Quantum Information and Quantum Optoelectronic Devices,School of Physics,Xi'An Jiaotong University,Xi'an,710049,China
2.Department of Physics and Astronomy,University of Pittsburgh,Pittsburgh,15260,United States
3.Department of Physics,Shenzhen Institute for Quantum Science and Engineering,Southern University of Science and Technology,Shenzhen,518055,China

Arzamasovs，Maksims,Li，Shuai,Han，Shuqi,et al. Topological superfluid of s -wave-interacting fermions by engineered orbital hybridization in an optical lattice[J]. Physical Review A,2023,107(3).

Arzamasovs，Maksims,Li，Shuai,Han，Shuqi,Liu，W. Vincent,&Liu，Bo.(2023).Topological superfluid of s -wave-interacting fermions by engineered orbital hybridization in an optical lattice.Physical Review A,107(3).

Arzamasovs，Maksims,et al."Topological superfluid of s -wave-interacting fermions by engineered orbital hybridization in an optical lattice".Physical Review A 107.3(2023).