Rotational superradiance affects the dynamics of many rotating systems in nature, through either stimulated or spontaneous extraction energy and angular momentum. By now, this process is well-studied relativistic setting, where are intrinsically dispersion-free. In condensed matter systems, however, dispersion an unavoidable aspect description for short wavelength modes. For these how might one...

We present rigorous results on the diagonalization of Bogoliubov Hamiltonian for a soliton condensate. Using the complete and orthonomalized set of eigenfunction for the Bogoliubov de Gennes equations, we calculate exactly the quantum depletion of the condensate and show that two degenerate zero-modes, which originate from a U(1) guageand a translational-symmetry breaking of the system, induce ...

Dipole excitations in neutron-rich nuclei below the neutron threshold are investigated. The method is based on Hartree-Fock-Bogoliubov (HFB) and Quasiparticle-Phonon Model (QPM) theory. Of our special interest are the properties of the low-lying 1 Pygmy Resonance and the two-phonon quadrupole-octupole 1 states in Sn-isotopes including exploratory investigations for the experimentally unknown ma...