Phonon spectroscopy by electric measurements of coupled quantum dots

A. Ueda*, O. Entin-Wohlman, M. Eto, A. Aharony

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

11 Scopus citations


We propose phonon spectroscopy by electric measurements of the low-temperature conductance of coupled quantum dots, specifically employing dephasing of the quantum electronic transport by the phonons. The setup we consider consists of a T-shaped double-quantum-dot (DQD) system in which only one of the dots (dot 1) is connected to external leads and the other (dot 2) is coupled solely to the first one. For noninteracting electrons, the differential conductance of such a system vanishes at a voltage located in-between the energies of the bonding and the antibonding states, due to destructive interference. When electron phonon (e-ph) on the DQD is invoked, we find that, at low temperatures, phonon emission taking place on dot 1 does not affect the interference, while phonon emission from dot 2 suppresses it. The amount of this suppression, as a function of the bias voltage, follows the effective e-ph coupling reflecting the phonon density of states and can be used for phonon spectroscopy.

Original languageEnglish
Article number245317
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number24
StatePublished - 2010


FundersFunder number
Japan Society for the Promotion of Science22540333


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