Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/4872
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Title: Backaction of a charge detector on a double quantum dot
Authors: Ouyang, S
Lam, CH 
You, JQ
Issue Date: 15-Feb-2010
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.
Keywords: Eigenvalues and eigenfunctions
Master equation
Quantum dots
Quantum point contacts
Publisher: American Physical Society
Journal: Physical review. B, Condensed matter and materials physics 
ISSN: 1098-0121
EISSN: 1550-235X
DOI: 10.1103/PhysRevB.81.075301
Rights: Physical Review B © 2010 The American Physical Society. The Journal's web site is located at http://prb.aps.org/
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