Roton softening and supersolidity in Rb spinor condensates

Details Roton softening and supersolidity in Rb spinor condensates Roton softening and supersolidity in Rb spinor condensates

2008-06-12

arxiv.org/abs/0806.1991v1

Physics

Condensed Matter

Other Condensed Matter

8 pages, 5 figures

Scientific paper

Superfluids with a tendency towards periodic crystalline order have both a phonon and roton like spectrum of collective modes. The softening of the roton spectrum provides one route to a supersolid. We show that roton softening occurs in 87Rb spinor condensates once dipolar interactions and spin dynamics are taken into account. By including the effects of a quasi-two-dimensional geometry and rapid Larmor precession, we show a dynamical instability develops in the collective mode spectrum at finite wavevectors. We construct phase diagrams showing a variety of instabilities as a function of the direction of the magnetic field and strength of the quadratic Zeeman shift. Our results provide a possible explanation of current experiments in the Berkeley group Phys. Rev. Lett. 100:170403 (2008).

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