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Ultrasharp Crossover from Quantum to Classical Decay in a Quantum Dot Flanked by a Double-Barrier Tunneling Structure

Research paper by Denis A. Gorokhov, Rava A. da Silveira

Indexed on: 01 Aug '03Published on: 01 Aug '03Published in: Physics - Mesoscopic Systems and Quantum Hall Effect



Abstract

The decay of metastable states is dominated by quantum tunneling at low temperatures and by thermal activation at high temperatures. The escape rate of a particle out of a square well is calculated within a semi-classical approximation and exhibits an `ultrasharp' crossover: a kink in the decay rate separates a purely quantum regime at low temperatures from a purely thermal regime at high temperatures. An experimental system -- a quantum dot supplemented by a semiconductor heterostructure -- that may be used to check the prediction, along with necessary experimental conditions, are described.