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arXiv · 1809.01208

Experimental realization of a superfluid stripe phase in a spin-orbit-coupled Bose-Einstein condensate enabled by momentum-space hopping

Thomas M. Bersano·Junpeng Hou·Sean Mossman·Vandna Gokhroo·Xi-Wang Luo·Kuei Sun·Chuanwei Zhang·Peter Engels
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Abstract

In the past few decades, the search for supersolid-like phases has attracted great attention in condensed matter and ultracold atom communities. Here we experimentally demonstrate a route for realizing a superfluid stripe-phase in a spin-orbit coupled Bose-Einstein condensate by employing a weak optical lattice to induce momentum-space hopping between two spin-orbit band minima. We characterize the striped ground state as a function of lattice coupling strength and spin-orbit detuning and find good agreement with mean-field simulations. We observe coherent Rabi oscillations in momentum space between two band minima and demonstrate a long lifetime of the ground state. Our work offers an exciting new and stable experimental platform for exploring superfluid stripe-phases and their exotic excitations, which may shed light on the properties of supersolid-like states.

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Thomas M. Bersano, Junpeng Hou, Sean Mossman, Vandna Gokhroo, Xi-Wang Luo, Kuei Sun, Chuanwei Zhang, Peter Engels. 2018-09-04. Experimental realization of a superfluid stripe phase in a spin-orbit-coupled Bose-Einstein condensate enabled by momentum-space hopping. https://doi.org/10.1103/physreva.99.051602

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