Weak Charge Quantization as an Instanton of Interacting sigma-model

2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/216997Coulomb 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.4 pages. The 2D case substantially modifiedMesoscale and Nanoscale PhysicsWeak Charge Quantization as an Instanton of Interacting sigma-modeltext