Mechanically probing coherent tunnelling in a double quantum dot

Details Mechanically probing coherent tunnelling in a double quantum dot Mechanically probing coherent tunnelling in a double quantum dot

2011-09-07

arxiv.org/abs/1109.1445v2

Phys. Rev. B 84, 205316 (2011)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

6 pages, 2 figures

Scientific paper

10.1103/PhysRevB.84.205316

We study theoretically the interaction between the charge dynamics of a few-electron double quantum dot and a capacitively-coupled AFM cantilever, a setup realized in several recent experiments. We demonstrate that the dot-induced frequency shift and damping of the cantilever can be used as a sensitive probe of coherent inter-dot tunnelling, and that these effects can be used to quantitatively extract both the magnitude of the coherent interdot tunneling and (in some cases) the value of the double-dot T_1 time. We also show how the adiabatic modulation of the double-dot eigenstates by the cantilever motion leads to new effects compared to the single-dot case.

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