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|Title:||Backaction of a charge detector on a double quantum dot|
You, J. Q.
|Subjects:||Eigenvalues and eigenfunctions|
Quantum point contacts
|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/|
|Appears in Collections:||AP Journal/Magazine Articles|
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