Phonon-assisted resonant tunneling through a triple-quantum-dot: a phonon-signal detector

Details Phonon-assisted resonant tunneling through a triple-quantum-dot: a phonon-signal detector Phonon-assisted resonant tunneling through a triple-quantum-dot: a phonon-signal detector

2007-12-06

arxiv.org/abs/0712.0935v1

Chin. Phys. Lett. 25, 683 (2008).

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

3 pages, 3 figures

Scientific paper

10.1088/0256-307X/25/2/089

We study the effect of electron-phonon interaction on current and zero-frequency shot noise in resonant tunneling through a series triple-quantum-dot coupling to a local phonon mode by means of a nonperturbative mapping technique along with the Green function formulation. By fixing the energy difference between the first two quantum dots to be equal to phonon frequency and sweeping the level of the third quantum dot, we find a largely enhanced current spectrum due to phonon effect, and in particular we predict current peaks corresponding to phonon-absorption and -emission assisted resonant tunneling processes, which shows that this system can be acted as a sensitive phonon-signal detector or as a cascade phonon generator.

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