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Fermi-Pasta-Ulam Physics with Nanomechanical Graphene Resonators: Intrinsic Relaxation and Thermalization from Flexural Mode Coupling

Daniel Midtvedt (Institutionen för teknisk fysik, Kondenserade materiens teori) ; Alexander Croy (Institutionen för teknisk fysik, Kondenserade materiens teori) ; Andreas Isacsson (Institutionen för teknisk fysik, Kondenserade materiens teori) ; Z. A. Qi ; H. S. Park
Physical Review Letters (0031-9007). Vol. 112 (2014), 14,
[Artikel, refereegranskad vetenskaplig]

Thermalization in nonlinear systems is a central concept in statistical mechanics and has been extensively studied theoretically since the seminal work of Fermi, Pasta, and Ulam. Using molecular dynamics and continuum modeling of a ring-down setup, we show that thermalization due to nonlinear mode coupling intrinsically limits the quality factor of nanomechanical graphene drums and turns them into potential test beds for Fermi-Pasta-Ulam physics. We find the thermalization rate Gamma to be independent of radius and scaling as Gamma similar to T* /is an element of(2)(pre), where T* and is an element of(pre) are effective resonator temperature and prestrain.

Nyckelord: MONOLAYER GRAPHENE, ELASTIC PROPERTIES, SYSTEMS, DISSIPATION, DYNAMICS, LIMIT, Physics, Multidisciplinary



Denna post skapades 2014-07-24. Senast ändrad 2015-02-11.
CPL Pubid: 200711

 

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Institutioner (Chalmers)

Institutionen för teknisk fysik, Kondenserade materiens teori (1900-2015)

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Fysik

Chalmers infrastruktur

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