Atoms in a radiofrequency-dressed optical lattice

Abstract

We load cold atoms into an optical lattice dramatically reshaped by radiofrequency (rf) coupling of state-dependent lattice potentials. This rf dressing changes the unit cell of the lattice at a subwavelength scale, such that its curvature and topology departs strongly from that of a simple sinusoidal lattice potential. Radiofrequency dressing has previously been performed at length scales from mm to tens of microns, but not at the single-optical-wavelength scale. At this length scale significant coupling between adiabatic potentials leads to nonadiabatic transitions, which we measure as a function of lattice depth and dressing frequency and amplitude. We also investigate the dressing by measuring changes in the momentum distribution of the dressed states.

5 pages, 4 figures

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• Dark-State Optical Potential Barriers with Nanoscale Spacing
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• Superfluidity breakdown of Rabi-coupled two-component Bose-Einstein condensates in optical lattices
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• Nonadiabatic Diffraction of Matter Waves
• Quantum Simulations with Bilayer 2D Bose Gases in Multiple-RF-dressed Potentials
• In-situ magnetometry for experiments with atomic quantum gases
• Nonadiabatic decay of metastable states on coupled linear potentials
• Inelastic losses in radiofrequency-dressed traps for ultracold atoms
• Topological charge pumping with subwavelength Raman lattices
• Creating versatile atom traps by applying near resonant laser light in magnetic traps
• Emergent topological properties in spatially modulated sub-wavelength barrier lattices