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Snir Gazit1,2, Daniel Podolsky2, Heloise Nonne2

  • 1Department of Physics, University of California, Berkeley, California 94720, USA.

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Summary
This summary is machine-generated.

We explain optical modes in solid helium-4 using amplitude (Higgs) modes. Our findings reveal a finite frequency excitation at zero momentum, advancing condensed matter physics.

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Area of Science:

  • Condensed matter physics
  • Quantum mechanics
  • Solid-state physics

Background:

  • Inelastic neutron scattering experiments observed unexpected optical modes in solid helium-4.
  • Previous theoretical models did not fully explain these excitations.

Purpose of the Study:

  • To provide a theoretical explanation for the observed optical modes in solid helium-4.
  • To identify the nature of these excitations as amplitude (Higgs) modes.

Main Methods:

  • Developed an effective Ginzburg-Landau model to analyze the modes.
  • Classified the modes based on their symmetry properties.
  • Calculated the dynamical structure factor using ab initio quantum Monte Carlo simulations.

Main Results:

  • The observed optical modes are attributed to amplitude (Higgs) modes related to order parameter fluctuations.
  • The Ginzburg-Landau model successfully predicts the signature of these modes in scattering experiments.
  • Quantum Monte Carlo simulations reveal a finite frequency excitation at zero relative momentum.

Conclusions:

  • The theoretical framework successfully explains the optical modes in solid helium-4.
  • Amplitude (Higgs) modes are a key feature of the bcc solid phase of helium-4.
  • The study provides a deeper understanding of excitations in quantum solids.