Triple quantum dot charging rectifier

Vidan, A.; Westervelt, R.M.; Stopa, M.; Hanson, M.; Gossard, A.C.
October 2004
Applied Physics Letters;10/18/2004, Vol. 85 Issue 16, p3602
Academic Journal
Three tunnel-coupled quantum dots in the Coulomb blockade regime act as a molecular rectifier. We have realized this device in a GaAs/Al0.3Ga0.7As heterostructure containing a two-dimensional electron gas using lithographically patterned gates. The current through two tunnel-coupled dots in series is recorded versus applied voltage. Ratchet behavior is created by a third dot, with one lead, tunnel-coupled to one of the two dots. An electron enters the third dot where it is trapped, producing a jamming effect where no other electron may enter the device. The current–voltage characteristics show rectification and negative resistance arising from charging of the third dot.


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