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Energy-dependent path of dissipation in nanomechanical resonators

Guttinger, Johannes; Noury, Adrien; Weber, Peter; Eriksson, Axel Martin; Lagoin, Camille; Moser, Joel; Eichler, Christopher; Wallraff, Andreas; Isacsson, Andreas; Bachtold, Adrian

NATURE NANOTECHNOLOGY
2017
VL / 12 - BP / 631 - EP / 636
abstract
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.

AccesS level

Green published

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