title: Collective Modes in a Quantum Solid.
abstract: We provide a theoretical explanation for the optical modes observed in inelastic neutron scattering on the bcc solid phase of helium 4 [T. Markovich et al., Phys. Rev. Lett. 88, 195301 (2002)]. We argue that these excitations are amplitude (Higgs) modes associated with fluctuations of the crystal order parameter within the unit cell. We present an analysis of the modes based on an effective Ginzburg-Landau model, classify them according to their symmetry properties, and compute their signature in inelastic neutron scattering experiments. In addition, we calculate the dynamical structure factor by means of an ab intio quantum Monte Carlo simulation and find a finite frequency excitation at zero relative momentum.
authors: Department of Physics, University of California, Berkeley, California 94720, USA.|Physics Department, Technion, 32000 Haifa, Israel.
authors: Snir
authors: S
authors: Gazit
authors: Physics Department, Technion, 32000 Haifa, Israel.
authors: Daniel
authors: D
authors: Podolsky
authors: Physics Department, Technion, 32000 Haifa, Israel.
authors: Heloise
authors: H
authors: Nonne
authors: Physics Department, Technion, 32000 Haifa, Israel.
authors: Assa
authors: A
authors: Auerbach
authors: Department of Physics, University of California at San Diego, La Jolla, California 92093, USA.
authors: Daniel P
authors: DP
authors: Arovas