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The ubiquitous existence of low-energy excitations in disordered solids has proved a longstanding problem. These states have been empirically described, but never directly observed. More importantly the ‘why’ of their nearly uniform density and dynamical properties in disordered materials as diverse as floppy polymers and rigid silica has never been explained. Coming back to this field after a forty-year absence, I find theoretical and experimental advances that allow one to begin addressing this question. On the experimental side, disordered films can be prepared, by varying quench rates much more than previously, with correspondingly wider ranges of thermally induced disorder. This should allow mapping the density of such states with the density/disorder in the film. On the theoretical side, computer simulations of packed spheres show the existence of zero-energy states, the density of which vary with a power law of the density difference from a critical density. These are found to be localized states arising from the coordinate motion of O(10)s of spheres. It would be interesting to extend such simulations to structures with directed bonds.
The experimental program has been started using a-Se, whose helical chain structure makes it relatively easy to form a glass for which there are no questions of stoichiometry, and whose low temperature glass transition (Tg~50C) simplifies the quenching-requenching process. 1 K mechanical loss measurements are made by Dr. Xiao Liu, a colleague at the Naval Research Laboratory.
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论文共 468 篇作者统计合作学者相似作者
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Peng Luo,Sarah E. Wolf,Shivajee Govind,Richard B. Stephens,Dong Hyup Kim, Cindy Y. Chen, Truc Nguyen,Patryk Wąsik,Mikhail Zhernenkov, Brandon Mcclimon,Zahra Fakhraai
Nature materials (2024)
Proceedings of the National Academy of Sciences of the United States of Americano. 39 (2020): 24076-24081
ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY (2019)
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I. Prencipe,J. Fuchs,S. Pascarelli,D. W. Schumacher,R. B. Stephens,N. B. Alexander,R. Briggs, M. Buescher,M. O. Cernaianu,A. Choukourov,M. De Marco,A. Erbe,J. Fassbender,G. Fiquet,P. Fitzsimmons,C. Gheorghiu,J. Hund,L. G. Huang,M. Harmand,N. J. Hartley,A. Irman,T. Kluge,Z. Konopkova,S. Kraft,D. Kraus,V. Leca,D. Margarone,J. Metzkes, K. Nagai,W. Nazarov,P. Lutoslawski,D. Papp,M. Passoni,A. Pelka,J. P. Perin, J. Schulz,M. Smid,C. Spindloe,S. Steinke,R. Torchio,C. Vass,T. Wiste,R. Zaffino,K. Zeil,T. Tschentscher,U. Schramm,T. E. Cowan
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#Papers: 468
#Citation: 15317
H-Index: 56
G-Index: 100
Sociability: 9
Diversity: 3
Activity: 7
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