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Related Experiment Videos

Dynamic scaling in diluted systems: deactivation through thermal dilution.

M I Marqués1, J A Gonzalo

  • 1Departamento de Física de Materiales C-IV, Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|June 21, 2001
PubMed
Summary

Activated scaling governs phase transitions in diluted Ising systems. Quantum Monte Carlo simulations reveal new deactivation phenomena in the quantum Griffiths-McCoy phase.

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Area of Science:

  • Condensed matter physics
  • Statistical mechanics
  • Quantum phase transitions

Background:

  • Diluted Ising systems exhibit complex phase transitions influenced by disorder.
  • Activated scaling describes critical phenomena in certain disordered systems.
  • Understanding these transitions is crucial for materials science and quantum computing.

Purpose of the Study:

  • To confirm activated scaling in transverse field-induced phase transitions of randomly diluted Ising systems.
  • To investigate the behavior of activated scaling across different concentrations relative to the percolation threshold (pc).
  • To explore phase transitions from ferromagnetic to quantum Griffiths phases and within the nonferromagnetic quantum Griffiths phase.

Main Methods:

  • Utilizing Quantum Monte Carlo (QMC) simulations.

Related Experiment Videos

  • Performing calculations at, below, and above the percolation threshold (pc).
  • Employing thermal dilution to study the Griffiths-McCoy phase.

    • Main Results:

    • Activated scaling is confirmed to hold in transverse field-induced phase transitions.
    • The evolution of activated scaling was tracked at zero temperature across various system dilutions.
    • A novel deactivation phenomenon was observed within the nonferromagnetic Griffiths-McCoy phase (p

    Conclusions:

    • Activated scaling is a robust feature in these disordered magnetic systems.
    • The study provides new insights into the complex behavior of quantum Griffiths phases.
    • The observed deactivation phenomenon offers a new avenue for understanding disorder effects in quantum systems.