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Paper detail

Collective modes in a quantum solid

We provide a theoretical explanation for the optical modes observed in inelastic neutron scattering (INS) on the bcc solid phase of helium 4 [T. Markovich, E. Polturak, J. Bossy, and E. Farhi, 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 INS 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.

preprint2015arXivOpen access
Snir GazitDaniel PodolskyHeloise NonneAssa AuerbachDaniel P. Arovas
cond-mat.stat-mechcond-mat.othercond-mat.str-el
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Snir GazitDaniel PodolskyHeloise NonneAssa AuerbachDaniel P. Arovas

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