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Amplitude mode in the quantum phase model.

S D Huber1, B Theiler, E Altman

  • 1Theoretische Physik, ETH Zurich, CH-8093 Zurich, Switzerland.

Physical Review Letters
|March 21, 2008
PubMed
Summary
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Researchers discovered a new gapped mode in interacting lattice bosons, complementing the known sound mode. This finding is crucial for understanding ultracold atoms in optical lattices and has experimental implications.

Area of Science:

  • Condensed Matter Physics
  • Quantum Many-Body Systems
  • Ultracold Atomic Gases

Background:

  • The quantum phase model describes interacting lattice bosons, crucial for understanding quantum phases of matter.
  • Superfluid states exhibit collective low-energy excitations, with the sound (Goldstone) mode being well-established.

Purpose of the Study:

  • To derive and characterize collective low-energy excitations in the superfluid state of the quantum phase model.
  • To identify any previously overlooked excitation modes and their physical relevance.

Main Methods:

  • Employed a dynamical variational approach to analyze the quantum phase model.
  • Focused on deriving collective excitations within the superfluid phase.

Main Results:

Related Experiment Videos

  • Successfully recovered the well-known sound (Goldstone) mode.
  • Derived a previously overlooked gapped (Higgs-type) mode.
  • This gapped mode is particularly relevant for ultracold atoms in strong optical lattice potentials.

Conclusions:

  • The dynamical variational approach reveals a new Higgs-type mode in interacting lattice bosons.
  • Predicted experimental signatures for detecting this gapped mode using lattice modulation.
  • Demonstrated the mode's evolution with increasing interaction strength, offering insights for ultracold atom experiments.