Collective Modes in a Quantum Solid

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

doi:10.1103/PhysRevLett.117.085302

Collective Modes in a Quantum Solid

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

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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 language	English
Article number	085302
Journal	Physical Review Letters
Volume	117
Issue number	8
DOIs	https://doi.org/10.1103/PhysRevLett.117.085302
State	Published - 15 Aug 2016
Externally published	Yes

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© 2016 American Physical Society.

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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.",

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AU - Arovas, Daniel P.

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AB - 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.

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Collective Modes in a Quantum Solid

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