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Topological insulators in cold-atom gases with non- Abelian gauge fields: the role of interactions

Peter P. Orth, Daniel Cocks, Michael Buchhold +3 more

Bulletin of the American Physical SocietyFeb 28, 20120 citations

Synthetic gauge potentials for cold atoms by shaking

Fernando Sols, C. E. Creffield

Bulletin of the American Physical SocietyJun 5, 20140 citations

Some topological states in one-dimensional cold atomic systems

Feng Mei, Dan-Wei Zhang, Shi-Liang Zhu

Annals of PhysicsJan 9, 20155 citations

Topological condensate in an interaction-induced gauge potential

Jun-Hui Zheng, Bo Xiong, Gediminas Juzeliūnas +1 more

We systematically investigate the ground-state and elementary excitations of a Bose-Einstein condensate within a synthetic vector potential, which is induced by the many-body effects and atom-light coupling. For a sufficiently strong spin-dependent interaction, we find the condensate undergoes a Stoner-type ferromagnetic transition through the self-consistent coupling with the vector potential. For a weak interaction, the critical velocity of a supercurrent is anisotropic due to the density fluctuations affecting the gauge field. We further analytically demonstrate the topological ground state with a coreless vortex ring in a three-dimensional (3D) harmonic trap and a coreless vortex-antivortex pair in a two-dimensional (2D) trap. The circulating persistent current is measurable in the time-of-flight experiment or in the dipolar oscillation through the violation of the Kohn theorem.We systematically investigate the ground-state and elementary excitations of a Bose-Einstein condensate within a synthetic vector potential, which is induced by the many-body effects and atom-light coupling. For a sufficiently strong spin-dependent interaction, we find the condensate undergoes a Stoner-type ferromagnetic transition through the self-consistent coupling with the vector potential. For a weak interaction, the critical velocity of a supercurrent is anisotropic due to the density fluctuations affecting the gauge field. We further analytically demonstrate the topological ground state with a coreless vortex ring in a three-dimensional (3D) harmonic trap and a coreless vortex-antivortex pair in a two-dimensional (2D) trap. The circulating persistent current is measurable in the time-of-flight experiment or in the dipolar oscillation through the violation of the Kohn theorem.

arXiv:1411.5868Physical Review AJul 2, 201518 citations

Programmable Gauge-Field Textures with Ultracold Atoms in Momentum Space

Hongru Wang, Hang Li, Yichen Pan +4 more

Synthetic gauge fields with ultracold atoms offer a route to quantum matter in which electromagnetic environments can be designed rather than merely imposed. While the Harper-Hofstadter model has been realized in several cold-atom systems, existing implementations are largely limited to spatially uniform magnetic fluxes. Here we experimentally realize a highly programmable two-dimensional momentum-state lattice of ultracold atoms with local control over the Peierls phase pattern, enabling direct implementation of Harper-Hofstadter Hamiltonians with tunable and spatially structured synthetic gauge fields. We observe a crossover from ballistic to strongly flux-modified bulk dynamics with suppressed transport. By introducing a synthetic electric field through site-dependent energy gradients, we further demonstrate Hall-type transverse drift arising from the interplay between electric and magnetic fields. In addition, we engineer a synthetic flux domain wall separating regions with opposite magnetic fluxes and observe anisotropic propagation guided along the interface. These results move cold-atom gauge-field engineering from uniform magnetic backgrounds toward designer gauge textures, providing an experimental setting for transport across programmable topological interfaces.Synthetic gauge fields with ultracold atoms offer a route to quantum matter in which electromagnetic environments can be designed rather than merely imposed. While the Harper-Hofstadter model has been realized in several cold-atom systems, existing implementations are largely limited to spatially uniform magnetic fluxes. Here we experimentally realize a highly programmable two-dimensional momentum-state lattice of ultracold atoms with local control over the Peierls phase pattern, enabling direct implementation of Harper-Hofstadter Hamiltonians with tunable and spatially structured synthetic gauge fields. We observe a crossover from ballistic to strongly flux-modified bulk dynamics with suppressed transport. By introducing a synthetic electric field through site-dependent energy gradients, we further demonstrate Hall-type transverse drift arising from the interplay between electric and magnetic fields. In addition, we engineer a synthetic flux domain wall separating regions with opposite magnetic fluxes and observe anisotropic propagation guided along the interface. These results move cold-atom gauge-field engineering from uniform magnetic backgrounds toward designer gauge textures, providing an experimental setting for transport across programmable topological interfaces.

cond-mat.quant-gasCross-listedarXiv:2606.15124Jun 16, 20260 citations

Synthetic gauge fields for ultracold atoms

Ross Williams

Bulletin of the American Physical SocietyMar 19, 20130 citations

2D and 3D topological states of cold atoms with synthetic gauge fields

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