Collective Modes in a Quantum Solid

Snir Gazit, Daniel Podolsky, Heloise Nonne, Assa Auerbach, Daniel P. Arovas

Research output: Contribution to journalArticlepeer-review

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.

Original languageAmerican English
Article number085302
JournalPhysical Review Letters
Volume117
Issue number8
DOIs
StatePublished - 15 Aug 2016
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2016 American Physical Society.

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