Phonon spectroscopy by electric measurements of coupled quantum dots

A. Ueda, O. Entin-Wohlman, Mikio Eto, A. Aharony

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

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
Volume82
Issue number24
DOIs
Publication statusPublished - 2010

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Electric variables measurement
Semiconductor quantum dots
quantum dots
Spectroscopy
Electrons
Quantum electronics
spectroscopy
quantum electronics
interference
electrons
electric potential
Phonons
Bias voltage
phonons
retarding
Temperature
Electric potential
energy

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

Phonon spectroscopy by electric measurements of coupled quantum dots. / Ueda, A.; Entin-Wohlman, O.; Eto, Mikio; Aharony, A.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 82, No. 24, 245317, 2010.

Research output: Contribution to journalArticle

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