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09:32
Cooling Rate Dependent Ellipsometry Measurements to Determine the Dynamics of Thin Glassy Films
Published on: January 26, 2016
Facilitated spin models of dissipative quantum glasses
Beatriz Olmos1, Igor Lesanovsky, Juan P Garrahan
1School of Physics and Astronomy, University of Nottingham, Nottingham, NG7 2RD, United Kingdom.
Physical Review Letters
|October 4, 2012
Summary
We introduce quantum facilitated spin models exhibiting glassy behavior due to kinetic constraints, not static order. These models show quantum dynamic heterogeneity and enhanced glassiness from quantum fluctuations.
Area of Science:
- Condensed matter physics
- Quantum mechanics
- Statistical mechanics
Background:
- Classical facilitated spin models exhibit complex dynamics due to kinetic constraints.
- Understanding glassy behavior in quantum systems is crucial for materials science and quantum computing.
Purpose of the Study:
- Introduce a novel class of dissipative quantum spin models.
- Investigate the emergence of glassy behavior in these quantum systems.
- Explore the role of kinetic constraints and quantum fluctuations in glassy dynamics.
Main Methods:
- Development of quantum analogs of classical facilitated spin models.
- Analysis of dissipative quantum spin models with local interactions.
- Study of systems without quenched disorder.
Main Results:
- Dissipative quantum spin models exhibit glassy behavior without static ordering.
- Dynamical arrest arises from kinetic constraints, not static correlations.
- Observed quantum dynamic heterogeneity and associated fluctuation phenomena like decoupling of time scales.
- Quantum fluctuations can enhance glassiness near the classical limit.
Conclusions:
- Quantum facilitated models offer a new framework for studying glassy dynamics.
- Kinetic constraints are key to understanding non-trivial dynamics in trivial stationary states.
- Quantum effects can significantly influence and enhance glassiness in spin systems.
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