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Depletion of Two-Level Systems in Ultrastable Computer-Generated Glasses
Dmytro Khomenko1,2, Camille Scalliet3, Ludovic Berthier4,5
1Laboratoire de Physique de l'Ecole Normale Supérieure, ENS, Université PSL, CNRS, Sorbonne Université, Université de Paris, 75005 Paris, France.
Physical Review Letters
|June 23, 2020
Summary
Researchers investigated amorphous solids and their low-temperature anomalies, attributing them to tunneling defects. Their study reveals that increased glass stability reduces these defects, with defects sometimes delocalizing across many atoms.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Amorphous Solids
Background:
- Amorphous solids display universal low-temperature anomalies.
- These anomalies are often linked to localized tunneling defects.
- Understanding these defects is crucial for characterizing glass properties.
Purpose of the Study:
- To investigate the origin of low-temperature anomalies in amorphous solids.
- To explore the nature and density of tunneling defects in glasses of varying stability.
- To computationally model the behavior of tunneling defects using advanced simulation techniques.
Main Methods:
- Utilized advanced Monte Carlo procedures to simulate glasses, from hyperquenched to ultrastable.
- Employed a multidimensional path-finding protocol to identify tunneling defects.
- Analyzed defects with energy splittings below k_{B}T_{Q} (quantum effects temperature).
Main Results:
- Glass stability influences the energy landscape and defect probing.
- Increased glass stability leads to a depletion in the density of tunneling defects.
- Tunneling defects were found to be mostly localized but occasionally delocalized.
Conclusions:
- The study provides in silico evidence supporting experimental observations of reduced tunneling defects in more stable glasses.
- The findings offer insights into the real-space nature and distribution of tunneling defects.
- This work advances the understanding of fundamental properties of amorphous solids.
