53 citations · 341 across the 22 of their papers we have counts for
15 papers · 1 filter
Superfluid density and collective modes of fermion superfluid in dice lattice
Yu-Rong Wu, Xiao-Fei Zhang, Chao-Fei Liu +2
The superfluid properties of attractive Hubbard model in dice lattice are investigated. It is found that three superfluid order parameters increase as the interaction increases. Wh…
Bound states in the continuum (BIC) protected by self-sustained potential barriers in a flat band system
Yi-Cai Zhang
In this work, we investigate the bound states in the continuum (BIC) of a one-dimensional spin-1 flat band system. It is found that, when the potential is sufficiently strong, ther…
Normal density and moment of inertia of a moving superfluid
Yi-Cai Zhang, Shu-Wei Song, Gang Chen
In this work, the normal density and moment of inertia of a moving superfluid are investigated. We find that, even at zero temperature, there exists a finite normal density f…
Collective excitations in two-dimensional SU() Fermi gases with tunable spin
Chengdong He, Zejian Ren, Bo Song +5
We measure collective excitations of a harmonically trapped two-dimensional (2D) SU() Fermi gas of Yb confined to a stack of layers formed by a one-dimensional optical l…
Two-fluid theory for superfluid system with anisotropic effective masses
Yi-Cai Zhang, Chao-Fei Liu, Bao Xu +2
In this work, we generalize the two-fluid theory to a superfluid system with anisotropic effective masses along different principal axis directions. As a specific example, such a t…
Generalized Josephson relation for conserved charges in multi-component bosons
Yi-Cai Zhang
The Josephson relation is generalized for conserved charges in multi-component bosons. With linear response theory, a formula for derivation of generalized superfluid density is gi…
Studies of Single Component Fermi Gas near a -wave Resonance with Lowest Order Constrained Variational Method
Guangcun Liu, Yi-Cai Zhang
We study single component Fermi gas near a -wave resonance with the lowest order constrained variational (LOCV) method. We obtain the energy per particle for the ground state of…
Strongly Interacting p-wave Fermi Gas in Two-Dimensions: Universal Relations and Breathing Mode
Yi-Cai Zhang, Shizhong Zhang
The contact is an important concept that characterizes the universal properties of a strongly interacting quantum gas. It appears in both thermodynamic (energy, pressure, etc.) and…
Collective Modes in a Two-band Superfluid of Ultracold Alkaline-earth Atoms Close to an Orbital Feshbach Resonance
Yi-Cai Zhang, Shanshan Ding, Shizhong Zhang
We discuss the collective modes in an alkaline-earth Fermi gas close to an orbital Feshbach resonance. Unlike the usual Feshbach resonance, the orbital Feshbach resonance in alkali…
Superfluid Density of a Spin-orbit Coupled Bose Gas
Yi-Cai Zhang, Zeng-Qiang Yu, Tai Kai Ng +3
We discuss the superfluid properties of a Bose-Einstein condensed gas with spin-orbit coupling, recently realized in experiments. We find a finite normal fluid density at zer…
Topological Superfluids and BEC-BCS Crossover in Attractive Haldane-Hubbard Model
Yi-Cai Zhang, Zhihao Xu, Shizhong Zhang
Motivated by the recent realization of the Haldane model in shaking optical lattice, we investigate the effects of attractive interaction and BEC-BCS crossover in this model at and…
Fragmentation of Spin-orbit Coupled Spinor Bose-Einstein Condensates
Shu-Wei Song, Yi-Cai Zhang, Hong Zhao +2
The fragmentation of spin-orbit coupled spin-1 Bose gas with a weak interaction in external harmonic trap is explored by both exact diagonalization and mean-field theory. This frag…
The confinement induced resonance in spin-orbit coupled cold atoms with Raman coupling
Yi-Cai Zhang, Shu-Wei Song, Wu-Ming Liu
We investigate the confinement induced resonance in spin-orbit coupled cold atoms with Raman coupling. We find that the quasi-bound levels induced by the spin-orbit coupling and Ra…
Zitterbewegung effect in spin-orbit coupled spin-1 ultracold atoms
Yi-Cai Zhang, Song-Wei Song, Chao-Fei Liu +1
The Zitterbewegung effect in spin-orbit coupled spin-1 cold atoms is investigated in the presence of the Zeeman field and a harmonic trap. It is shown that the Zeeman field and the…
Particle-hole bound states of dipolar molecules in optical lattice
Yi-Cai Zhang, Han-Ting Wang, Shun-Qing Shen +1
We investigate the particle-hole pair excitations of dipolar molecules in optical lattice, which can be described with an extended Bose-Hubbard model. For strong enough dipole-dipo…