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Analyzing Melts and Fluids from Ab Initio Molecular Dynamics Simulations with the UMD Package
06:37

Analyzing Melts and Fluids from Ab Initio Molecular Dynamics Simulations with the UMD Package

Published on: September 17, 2021

Analytic continuation average spectrum method for quantum liquids.

David R Reichman1, Eran Rabani

  • 1Department of Chemistry, Columbia University, 3000 Broadway, New York, New York 10027, USA. reichman@chem.columbia.edu

The Journal of Chemical Physics
|August 14, 2009
PubMed
Summary
This summary is machine-generated.

The average spectrum method (ASM) successfully reveals quantum fluid modes, outperforming maximum entropy for dynamic structure factors in realistic systems. This study marks the first ASM application in off-lattice quantum fluids.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Fluids
  • Computational Physics

Background:

  • Determining real-frequency density response from imaginary-time quantum Monte Carlo data is challenging.
  • Existing methods like maximum entropy often smooth out spectral features.

Purpose of the Study:

  • To apply and evaluate the average spectrum method (ASM) for analytical continuation of quantum Monte Carlo data.
  • To compare ASM with other methods in analyzing the dynamic structure factor of quantum fluids.

Main Methods:

  • Analytical continuation of imaginary-time quantum Monte Carlo data.
  • Application of the average spectrum method (ASM).
  • Comparison with maximum entropy and experimental/theoretical results.

Main Results:

  • ASM successfully resolved spectral modes in the dynamic structure factor of ortho-deuterium and liquid para-hydrogen.
  • Results from ASM align with experimental data and quantum mode-coupling theories.
  • Maximum entropy approach produced only a smooth, unimodal spectrum.

Conclusions:

  • The average spectrum method is effective for analyzing realistic off-lattice quantum fluid systems.
  • ASM provides a more detailed spectral representation compared to maximum entropy.
  • This work validates ASM for studying quantum fluid properties.