Donarini, Andrea and Begemann, Georg and Grifoni, Milena (2010) Interference effects in the Coulomb blockade regime: Current blocking and spin preparation in symmetric nanojunctions. Phys. Rev. B 82, p. 125451.
We consider nanojunctions in the single-electron tunneling regime which, due to a high degree of spatial symmetry, have a degenerate many-body spectrum. As a consequence, interference phenomena which cause a current blocking can occur at specific values of the bias and gate voltage. We present here a general formalism to give necessary and sufficient conditions for interference blockade also in the presence of spin-polarized leads. As an example we analyze a triple quantum-dot single-electron transistor. For a setup with parallel polarized leads, we show how to selectively prepare the system in each of the three states of an excited spin triplet without application of any external magnetic field.
|Date:||28 September 2010|
|Institutions:||Physics > Institute of Theroretical Physics > Chair Professor Grifoni > Group Milena Grifoni|
|Projects:||SFB 689: Spinphänomene in reduzierten Dimensionen, SPP 1243: Quantum transport at the molecular scale|
|Research groups and research centres:||Not selected|
|Subjects:||500 Science > 530 Physics|
|Refereed:||Yes, this version has been refereed|
|Created at the University of Regensburg:||Yes|
|Deposited On:||12 Nov 2010 08:31|
|Last Modified:||16 May 2012 08:58|