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http://hdl.handle.net/10397/4872
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/ |
Appears in Collections: | Journal/Magazine Article |
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Ouyang_Backaction_Double_Quantum.pdf | 677.51 kB | Adobe PDF | View/Open |
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