Controlling spin motion and interactions in a one-dimensional Bose gas

Abstract

Experiments on ultracold gases offer unparalleled opportunities to explore quantum many-body physics, with excellent control over key parameters including temperature, density, interactions and even dimensionality. In some systems, atomic interactions can be adjusted by means of magnetic Feshbach resonances, which have played a crucial role in realizing new many-body phenomena. However, suitable Feshbach resonances are not always available, and they offer limited freedom since the magnetic field strength is the only control parameter. Here we show a new way to tune interactions in one-dimensional quantum gases using state-dependent dressed potentials, enabling control over non-equilibrium spin motion in a two-component gas of 87Rb. The accessible range includes the point of spin-independent interactions where exact quantum many-body solutions are available and the point where spin motion is frozen. This versatility opens a new route to experiments on spin waves, spin-"charge" separation and the relation between superfluidity and magnetism in low-dimensional quantum gases.

15 pages, 5 figures

References in corpus (12)

• Many-Body Physics with Ultracold Gases
• Nonlinear atom interferometer surpasses classical precision limit
• Non-equilibrium coherence dynamics in one-dimensional Bose gases
• Radio-frequency dressed state potentials for neutral atoms
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