Journal
NATURE NANOTECHNOLOGY
Volume 12, Issue 7, Pages 631-636Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/NNANO.2017.86
Keywords
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Funding
- ERC [279278]
- EU Graphene Flagship [604391]
- Foundation Cellex [SEV-2015-0522]
- MINECO [MAT2012-31338]
- Fondo Europeo de Desarrollo Regional (FEDER)
- Generalitat through AGAUR
- Swedish Research Council
- Knut and Alice Wallenberg foundation
- European Research Council (ERC) [279278] Funding Source: European Research Council (ERC)
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Energy decay plays a central role in a wide range of phenomena(1-3), such as optical emission, nuclear fission, and dissipation in quantum systems. Energy decay is usually described as a system leaking energy irreversibly into an environmental bath. Here, we report on energy decay measurements in nanomechanical systems based on multilayer graphene that cannot be explained by the paradigm of a system directly coupled to a bath. As the energy of a vibrational mode freely decays, the rate of energy decay changes abruptly to a lower value. This finding can be explained by a model where the measured mode hybridizes with other modes of the resonator at high energy. Below a threshold energy, modes are decoupled, resulting in comparatively low decay rates and giant quality factors exceeding 1 million. Our work opens up new possibilities to manipulate vibrational states(4-7), engineer hybrid states with mechanical modes at completely different frequencies, and to study the collective motion of this highly tunable system.
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