Chunlei Qu
Stevens Institute of Technology
Ultracold atomPhysicsSpin–orbit interactionLattice (order)PairingPhase transitionDipoleBose gasAngular momentum couplingEffective mass (solid-state physics)SuperfluidityCondensed matter physicsMAJORANACoupling (physics)Orbit (control theory)Quantum electrodynamicsBose–Einstein condensateTotal angular momentum quantum numberFermionSpin (physics)Quantum mechanicsSpin-½QuantumOptical lattice
Publications 48
#1Michael A. PerlinH-Index: 5
#2Chunlei Qu (Stevens Institute of Technology)H-Index: 16
Last. Ana Maria ReyH-Index: 62
view all 3 authors...
We investigate many-body spin squeezing dynamics in an XXZ model with interactions that fall off with distance ras 1/r^\alphain D=2and 3spatial dimensions. In stark contrast to the Ising model, we find a broad parameter regime where spin squeezing comparable to the infinite-range \alpha=0limit is achievable even when interactions are short-ranged, \alpha>D A region of ``collective'' behavior in which optimal squeezing grows with system size extends all the way to the $\alpha\to...
8 CitationsSource
#1Chunlei Qu (CU: University of Colorado Boulder)H-Index: 16
#2Ana Maria Rey (CU: University of Colorado Boulder)H-Index: 62
The recent experimental realization of a three-dimensional (3D) optical lattice clock not only reduces the influence of collisional interactions on the clock's accuracy but also provides a promising platform for studying dipolar many-body quantum physics. Here, by solving the governing master equation, we investigate the role of both elastic and dissipative long-range interactions in the clock's dynamics and study its dependence on lattice spacing, dimensionality, and dipolar orientation. For sm...
17 CitationsSource
#1Chuan-Hsun Li (Purdue University)H-Index: 4
#2Chunlei Qu (UTD: University of Texas at Dallas)H-Index: 16
Last. Yong P. Chen (Purdue University)H-Index: 64
view all 12 authors...
Understanding the effects of spin-orbit coupling (SOC) and many-body interactions on spin transport is important in condensed matter physics and spintronics. This topic has been intensively studied for spin carriers such as electrons but barely explored for charge-neutral bosonic quasiparticles (including their condensates), which hold promises for coherent spin transport over macroscopic distances. Here, we explore the effects of synthetic SOC (induced by optical Raman coupling) and atomic inte...
11 CitationsSource
#1Lianghui HuangH-Index: 9
#2Peng PengH-Index: 4
Last. Jing ZhangH-Index: 39
view all 9 authors...
Periodic driving of a quantum system can significantly alter its energy bands and even change the band topology, opening a completely new avenue for engineering novel quantum matter. Although important progress has been made recently in measuring topological properties of Floquet bands in different systems, direct experimental measurement of Floquet band dispersions and their topology change is still demanding. Here we directly measure Floquet band dispersions in a periodically driven spin-orbit...
9 CitationsSource
By applying a position-dependent detuning to a spin-orbit-coupled Hamiltonian with equal Rashba and Dresselhaus coupling, we exploit the behavior of the angular momentum of a harmonically trapped Bose-Einstein condensed atomic gas and discuss the distinctive role of its canonical and spin components. By developing the formalism of spinor hydrodynamics, we predict the precession of the dipole oscillation caused by the synthetic rotational field, in analogy with the precession of the Foucault pend...
3 Citations
#1Eleonora Fava (University of Trento)H-Index: 6
#2Tom Bienaimé (University of Trento)H-Index: 15
Last. Gabriele Ferrari (University of Trento)H-Index: 29
view all 8 authors...
The spin dynamics of a harmonically trapped Bose-Einstein condensed binary mixture of sodium atoms is experimentally investigated at finite temperature. In the collisional regime the motion of the thermal component is shown to be damped because of spin drag, while the two condensates exhibit a counter flow oscillation without friction, thereby providing direct evidence for spin superfluidity. Results are also reported in the collisionless regime where the spin components of both the condensate a...
43 CitationsSource