Atom-optically synthetic gauge fields for a noninteracting Bose gas

Abstract

Synthetic gauge fields in synthetic dimensions are now of great interest. This concept provides a convenient manner for exploring topological phases of matter. Here, we report on the first experimental realization of an atom-optically synthetic gauge field based on the synthetic momentum-state lattice of a Bose gas of 133Cs atoms, where magnetically controlled Feshbach resonance is used to tune the interacting lattice into noninteracting regime. Specifically, we engineer a noninteracting one-dimensional lattice into a two-leg ladder with tunable synthetic gauge fields. We observe the flux-dependent populations of atoms and measure the gauge field-induced chiral currents in the two legs. We also show that an inhomogeneous gauge field could control the atomic transport in the ladder. Our results lay the groundwork for using a clean noninteracting synthetic momentum-state lattice to study the gauge field-induced topological physics.

The photogalvanic effect induced by quantum spin Hall edge states from first-principles calculations

“…Therefore, the edge states on the surface of a topological insulator are topologically protected and are basically not affected by impurities and defects during their transport. 4,9,10,[13][14][15][16] In addition, at the edge of topological insulators, electrons with different spins move in opposite directions, so the spin degrees of freedom of the electrons can be used as transport information carriers. 4,17 Compared with the traditional transfer of information through electric charge, this process ideally has no energy loss, which provides a new direction for the design of spintronic devices with low energy dissipation.…”

Optimal subradiant spin wave exchange in dipole-coupled atomic ring arrays

“…In atomic systems, spontaneous emission is the dominant relaxation process. The atomic arrays serve as an ideal, pure platform for nonlinear quantum optics [17][18][19], quantum simulation [20][21][22], and Bose-Einstein condensate [23][24][25]. Especially, energy transfer without loss is a promising prospect in many physical applications including photosynthetic processes in biological systems [26][27][28][29] and state transfer in optical quantum communication [30].…”

Electrically tunable Berry curvature and strong light-matter coupling in liquid crystal microcavities with 2D perovskite

“…There has been surging interest from condensed matter and solidstate communities in generating artificial gauge fields across various platforms as a means to describe particle properties (1) such as cold atoms (2)(3)(4)(5), photonic materials (6,7), acoustics (8), mechanical systems (9), and exciton-polariton cavities (10)(11)(12). Gauge fields play an important role in topological properties of matter (13,14) and can describe a fundamental band property known as the Berry curvature (15,16), quantifying the topological invariants of the system.…”