Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/4872
Title: Backaction of a charge detector on a double quantum dot
Authors: Ouyang, Shihua
Lam, Chi-Hang
You, J. Q.
Subjects: Eigenvalues and eigenfunctions
Master equation
Quantum dots
Quantum point contacts
Issue Date: 15-Feb-2010
Publisher: American Physical Society
Source: Physical review B, condensed matter and materials physics, 15 Feb. 2010, v. 81, no. 7, 075301, p. 1-6.
Abstract: 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 [ S. Gustavsson et al. Phys. Rev. Lett. 99 206804 (2007)]. Moreover, we propose a scheme to generate a pure spin current by the QPC in the absence of a charge current.
Rights: Physical Review B © 2010 The American Physical Society. The Journal's web site is located at http://prb.aps.org/
Type: Journal/Magazine Article
URI: http://hdl.handle.net/10397/4872
DOI: 10.1103/PhysRevB.81.075301
ISSN: 1098-0121 (print)
1550-235X (online)
Appears in Collections:AP Journal/Magazine Articles

Files in This Item:
File Description SizeFormat 
Ouyang_Backaction_Double_Quantum.pdf677.51 kBAdobe PDFView/Open


All items in the PolyU Institutional Repository are protected by copyright, with all rights reserved, unless otherwise indicated. No item in the PolyU IR may be reproduced for commercial or resale purposes.