Yongqiang Li
Many-Body Chiral Edge Currents and Sliding Phases of Atomic Spin Waves in Momentum-Space Lattice
Li, Yongqiang; Cai, Han; Wang, Da-wei; Li, Lin; Yuan, Jianmin; Li, Weibin
Authors
Abstract
Collective excitations (spinwaves) of long-lived atomic hyperfine states can be synthesized into a Bose-Hubbard model in momentum space. We explore many-body ground states and dynamics of a two-leg momentum-space lattice formed by two coupled hyperfine states. Essential ingredients of this setting are a staggered artificial magnetic field engineered by lasers that couple the spinwave states, and a state-dependent long-range interaction, which is induced by laser-dressing a hyperfine state to a Rydberg state. The Rydberg dressed two-body interaction gives rise to a state-dependent blockade in momentum space, and can amplify staggered flux induced anti-chiral edge currents in the many-body ground state in the presence of magnetic flux. When the Rydberg dressing is applied to both hyperfine states, exotic sliding insulating and superfluid/supersolid phases emerge. Due to the Rydberg dressed long-range interaction, spinwaves slide along a leg of the momentum-space lattice without costing energy. Our study paves a route to the quantum simulation of topological phases and exotic dynamics with interacting spinwaves of atomic hyperfine states in momentum-space lattice. Introduction-Chiral edge states have played an important role in understanding quantum Hall effects [1-3] in solid state materials [4-6]. Ultracold atoms exposed to artificial gauge fields provide an ideal platform to simulate chiral edge currents in and out of equilibrium. This is driven by the ability to precisely control and in-situ monitor [7, 8] internal and external degrees of freedom, and atom-atom interactions [9]. Chiral dynamics [10-13] has been examined in the continuum space [14, 15], ladders [16-20], and optical lattices [21-28]. However, chiral states realized in the coordinate space require extremely low temperatures (typical in the order of a few kilo Hz) to protect the topological states from being destroyed by motional fluctuations [13]. Up to now, experimental observations of chiral phenomena in ultracold gases are largely at a single-particle level, due to unavoidable dis-sipations (e.g. spontaneous emission and heating) [9, 29-33], while the realization of many-body chiral edge currents in ultracold atoms is still elusive.
Citation
Li, Y., Cai, H., Wang, D.-W., Li, L., Yuan, J., & Li, W. (2020). Many-Body Chiral Edge Currents and Sliding Phases of Atomic Spin Waves in Momentum-Space Lattice. Physical Review Letters, 124(14), Article 140401. https://doi.org/10.1103/physrevlett.124.140401
Journal Article Type | Article |
---|---|
Acceptance Date | Mar 16, 2020 |
Online Publication Date | Apr 9, 2020 |
Publication Date | Apr 9, 2020 |
Deposit Date | Mar 18, 2020 |
Publicly Available Date | Apr 9, 2020 |
Journal | Physical Review Letters |
Print ISSN | 0031-9007 |
Electronic ISSN | 1079-7114 |
Publisher | American Physical Society |
Peer Reviewed | Peer Reviewed |
Volume | 124 |
Issue | 14 |
Article Number | 140401 |
DOI | https://doi.org/10.1103/physrevlett.124.140401 |
Keywords | General Physics and Astronomy |
Public URL | https://nottingham-repository.worktribe.com/output/4165882 |
Publisher URL | https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.124.140401 |
Files
1909.00750
(4.5 Mb)
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