Smearing of charge fluctuations in a grain by spin-flip assisted tunneling

Details Smearing of charge fluctuations in a grain by spin-flip assisted tunneling Smearing of charge fluctuations in a grain by spin-flip assisted tunneling

2002-10-16

arxiv.org/abs/cond-mat/0210342v2

PRB 67, R201308 2003

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 1 figure, final version for PRB Rapid Comm

Scientific paper

10.1103/PhysRevB.67.201308

We investigate the charge fluctuations of a grain (large dot) coupled to a lead via a small quantum dot in the Kondo regime. We show that the strong entanglement of charge and spin flips in this setup can result in a stable SU(4) Kondo fixed point, which considerably smears out the Coulomb staircase behavior already in the weak tunneling limit. This behavior is robust enough to be experimentally observable.

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