Species-Selective Manipulation of a Multi-Component Quantum Gas

Quantum simulation experiments that use mixtures of atomic species promise new insight into the behaviour of impurities coupled to larger quantum systems. In doing so, we require methods to manipulate the individual constituents of such a mixture when investigating a number of applications, for example the direct quantum simulation of impurity physics.

We are working on a scheme in which species-selective control is achieved using magnetic potentials dressed with multiple radiofrequencies (RFs), exploiting the different Lande gF -factors of the constituent atomic species [1]. The resulting potentials have low heating rates, and are extremely smooth and free from defects. Species with Lande g-factors that differ in sign or magnitude can be manipulated independently. We use a mixture of either two distinct atoms (Rb-87 and Rb-85) or different hyperfine states of the same atom (Rb-87, F = 1 & F = 2).

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Above: a) For an F = 1 atom (Rb-87), two applied RFs create two avoided crossings in the system eigenenergies which form adiabatic potentials. b) An appropriate choice of frequencies leads to avoided crossings forming at similar spatial locations for two species with different gF - factors (Rb87, F = 1 & Rb-85, F = 2). c) Adjusting the amplitude of the applied RFs changes the gravitational sag experienced by each species, allowing each cloud to be separately manipulated.

[1] E. Bentine, T. L. Harte, K. Luksch, A. J. Barker, J. Mur-Petit, B. Yuen, C. J. Foot, Species-selective confinement of atoms dressed with multiple radiofrequencies, J. Phys. B: At. Mol. Opt. Phys. 50 094002 (2017), arXiv:1701.05819