Phonon spectroscopy by electric measurements of coupled quantum dots

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

研究成果: Article査読

9 被引用数 (Scopus)

抄録

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.

本文言語English
論文番号245317
ジャーナルPhysical Review B - Condensed Matter and Materials Physics
82
24
DOI
出版ステータスPublished - 2010

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学

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