Magnetic field switching in parallel quantum dotsFeng Li1, Xin-Qi Li1, Wei-Min Zhang2, 3 and S. A. Gurvitz4
1 State Key Laboratory for Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences - P.O. Box 912, Beijing 100083, China
2 National Center for Theoretical Science - Tainan, Taiwan 70101, ROC
3 Department of Physics and Center for Quantum Information Science, National Cheng Kung University Tainan, Taiwan 70101, ROC
4 Department of Particle Physics, Weizmann Institute of Science - Rehovot 76100, Israel
received 5 August 2009; accepted in final form 13 October 2009; published November 2009
published online 19 November 2009
We show that the Coulomb blockade in parallel dots pierced by magnetic flux completely blocks the resonant current for any value of except for integer multiples of the flux quantum . This non-analytic (switching) dependence of the current on arises only when the dot states that carry the current are of the same energy. The time needed to reach the steady state, however, diverges when .
73.23.-b - Electronic transport in mesoscopic systems.
73.23.Hk - Coulomb blockade; single-elctron tunneling.
05.60.Gg - Quantum transport.
© EPLA 2009