Cherng, R. W.Demler, Eugene2016-04-052009Cherng, R. W., and E. Demler. 2009. “Magnetoroton Softening in Rb Spinor Condensates with Dipolar Interactions.” Physical Review Letters 103 (18) (October 27). doi:10.1103/physrevlett.103.185301.0031-9007http://nrs.harvard.edu/urn-3:HUL.InstRepos:26370383Superfluids 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-twodimensionality and rapid Larmor precession.en-USJournal Article2016-04-0510.1103/PhysRevLett.103.185301