Weak Charge Quantization as an Instanton of Interacting sigma-model

Details Weak Charge Quantization as an Instanton of Interacting sigma-model Weak Charge Quantization as an Instanton of Interacting sigma-model

2000-02-24

arxiv.org/abs/cond-mat/0002385v2

Phys.Rev.Lett.85:4160-4163,2000

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages. The 2D case substantially modified

Scientific paper

10.1103/PhysRevLett.85.4160

Coulomb blockade in a quantum dot attached to a diffusive conductor is considered in the framework of the non-linear sigma-model. It is shown that the weak charge quantization on the dot is associated with instanton configurations of the Q-field in the conductor. The instantons have a finite action and are replica non--symmetric. It is argued that such instantons may play a role in the transition regime to the interacting insulator.

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