53 citations · 341 across the 22 of their papers we have counts for
22 papers
Infinite bound states and energy spectrum induced by a Coulomb-like potential of type III in a flat band system
Yi-Cai Zhang
In this work, we investigate the bound states in a one-dimensional spin-1 flat band system with a Coulomb-like potential of type III, which has a unique non-vanishing matrix elemen…
Infinite bound states and hydrogen atom-like energy spectrum induced by a flat band
Yi-Cai Zhang, Guo-Bao Guo
In this work, we investigate the bound state problem in one dimensional spin-1 Dirac Hamiltonian with a flat band. It is found that, the flat band has significant effects on the bo…
Lyapunov exponent, mobility edges, and critical region in the generalized Aubry-Andre model with an unbounded quasiperiodic potential
Yi-Cai Zhang, Yan-Yang Zhang
In this work, we investigate the Anderson localization problems of the generalized Aubry-André model (Ganeshan-Pixley-Das Sarma's model) with an unbounded quasi-periodic potential…
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…
Superfluid density, Josephson relation and pairing fluctuations in a multi-component fermion superfluid
Yi-Cai Zhang
In this work, a Josephson relation is generalized to a multi-component fermion superfluid. Superfluid density is expressed through a two-particle Green function for pairing channel…
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…
Excitation Spectra and Hard-core Thermodynamics of Bosonic Atoms In Double Well Optical Lattices
Bao Xu, Hong-Ye Wu, Yi-Cai Zhang +2
A general coupled representation is proposed for bosonic atoms in double well optical lattices. Based on such a representation, we investigate the excitation spectra and thermodyna…
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…
Tuning a magnetic Feshbach resonance with spatially modulated laser light
Yi-Cai Zhang, Wu-Ming Liu, Hui Hu
We theoretically investigate the control of a magnetic Feshbach resonance using a bound-to-bound molecular transition driven by spatially modulated laser light. Due to the spatiall…
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…
Spin-orbit coupling induced separation and hidden spin textures in spin-1 Bose-Einstein condensates
Shu-Wei Song, Yi-Cai Zhang, Qing Sun +4
We analytically and numerically investigate the ground state of the spin-orbit coupled spin-1 Bose-Einstein condensates in an external parabolic potential. When the spin-orbit coup…
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…