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| A glass-to-glass transition in low-temperature glasses: numerical detections of the Gardner transition |
| 2015-11-18
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Institute of Theoretical Physics |
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Chinese Academy of Sciences |
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State Key Laboratory of Theoretical Physics |
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Seminar |
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Title
题目 |
A glass-to-glass transition in low-temperature glasses: numerical detections of the Gardner transition |
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Speaker
报告人 |
Yu-Liang Jin |
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Affiliation
所在单位 |
Laboratoire de Physique Theorique, ENS, France |
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Date
日期 |
15:30, Nov 18 (Wednesday), 2015 |
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Venue
地点 |
ITP New Building 6420, 理论物理研究所新楼四层多媒体教室 |
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Abstract
摘要 |
Low-temperature crystals can be modeled as harmonic vibrations, the phonons, around a perfect lattice. The resulting Debye theory perfectly predicts thermodynamic and transport properties. Low-temperature glasses instead display all kind of anomalies with respect to this description: anomalous specific heat and thermal conductivity; activated slow dynamics across barriers inside the glass; an abundance of soft vibration modes with respect to the Debye law, the so-called Boson Peak; marginal stability of mechanical excitations; a plastic and irreversible response to arbitrarily small strain amplitudes.
Here, we show that all these observations can be rationalized as the remanent of a novel phase transition—the Gardner transition—predicted by the mean field theory of glasses. The Gardner transition distinguishes between two types of amorphous solids: the simple mechanically stable glass and the marginally-stable glass. We explore numerical methods to detect the Gardner transition in several model glass formers. We show that the transition is associated to a significant growth of time and length scales, and a spatially heterogeneous organization of cages that confine particles' vibrations. We further provide concrete proposals for experiments in low-temperature glasses. |
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