title: Magnetoroton softening in Rb spinor condensates with dipolar interactions.
abstract: Superfluids with a tendency towards periodic order have both phonon- and rotonlike spectra. We show that magnetoroton softening occurs in 87Rb spinor condensates. A rich variety of dynamical instabilities emerges as a function of the magnetic field orientation and strength of the quadratic Zeeman shift. These instabilities are driven by an effective dipolar interaction modified dramatically by quasi-two-dimensionality and rapid Larmor precession.
authors.affiliation: Physics Department, Harvard University, Cambridge, Massachusetts 02138, USA.
authors.forename: R W
authors.initials: RW
authors.lastname: Cherng
authors.forename: E
authors.initials: E
authors.lastname: Demler