Backaction of a charge detector on a double quantum dot

Shi Hua Ouyang, Chi Hang Lam, J. Q. You

Research output: Journal article publicationJournal articleAcademic researchpeer-review

25 Citations (Scopus)


We develop a master equation approach to study the backaction of quantum-point contact (QPC) on a double quantum dot (DQD) at zero bias voltage. We reveal why electrons can pass through the zero-bias DQD only when the bias voltage across the QPC exceeds a threshold value determined by the eigenstate energy difference in the DQD. This derived excitation condition agrees well with experiments on QPC-induced inelastic electron tunneling through a DQD. Moreover, we propose a scheme to generate a pure spin current by the QPC in the absence of a charge current.
Original languageEnglish
Article number075301
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number7
Publication statusPublished - 2 Feb 2010

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials


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