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Resonantly Induced Friction and Frequency Combs in Driven Nanomechanical Systems.
M I Dykman1, Gianluca Rastelli2, M L Roukes3
1Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA.
Physical Review Letters
|July 27, 2019
Summary
We discovered a new friction mechanism in vibrating systems. This friction can be negative, causing self-sustained oscillations and a frequency comb in nanomechanical systems.
Area of Science:
- Physics
- Nanotechnology
- Mechanical Engineering
Background:
- Vibrational systems are fundamental in many scientific and engineering fields.
- Understanding friction is crucial for controlling system dynamics and energy dissipation.
Purpose of the Study:
- To propose a novel mechanism for friction in resonantly driven vibrational systems.
- To investigate the microscopic origins of this resonant friction in nanomechanical systems.
Main Methods:
- Derivation of friction force based on time- and spatial-symmetry arguments.
- Microscopic analysis of resonant forces in nanomechanical resonators.
Main Results:
- A new friction mechanism is proposed for resonantly driven systems.
- The friction force can exhibit negative values.
- Negative friction leads to self-sustained oscillations in amplitude and phase.
- A frequency comb is observed in the power spectrum due to these oscillations.
Conclusions:
- The proposed friction mechanism offers new insights into energy dissipation and oscillation control in nanomechanical systems.
- Negative friction can be a source of energy, driving self-sustained oscillations.
- The resulting frequency comb has potential applications in signal processing and frequency generation.
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