Damping of a nanomechanical oscillator strongly coupled to a quantum dot

Details Damping of a nanomechanical oscillator strongly coupled to a quantum dot Damping of a nanomechanical oscillator strongly coupled to a quantum dot

2009-10-02

arxiv.org/abs/0910.0308v1

Phys. Rev. Lett. 104, 017203 (2010)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4+ pages, 4 figures

Scientific paper

10.1103/PhysRevLett.104.017203

We present theoretical and experimental results on the mechanical damping of an atomic force microscope cantilever strongly coupled to a self-assembled InAs quantum dot. When the cantilever oscillation amplitude is large, its motion dominates the charge dynamics of the dot which in turn leads to nonlinear, amplitude-dependent damping of the cantilever. We observe highly asymmetric lineshapes of Coulomb blockade peaks in the damping that reflect the degeneracy of energy levels on the dot, in excellent agreement with our strong coupling theory. Furthermore, we predict that excited state spectroscopy is possible by studying the damping versus oscillation amplitude, in analogy to varying the amplitude of an ac gate voltage.

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