  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.
