Quantum decoherence and weak localization at low temperatures

Autor:	Dmitrii S. Golubev, Andrei D. Zaikin
Rok vydání:	1999
Předmět:	Weak localization Physics symbols.namesake Pauli exclusion principle Quantum decoherence Quantum mechanics Quantum electrodynamics Path integral formulation symbols Wave function collapse Quantum dissipation Wave function Quantum Zeno effect
Zdroj:	Physical Review B. 59:9195-9213
ISSN:	1095-3795 0163-1829
DOI:	10.1103/physrevb.59.9195
Popis:	We develope a theory of a fundamental effect of the interaction-induced decoherence of the electron wave function in a disordered metal. With the aid of the Keldysh technique and the path integral formalism we derive a formally exact equation of motion for the electron density matrix in the presence of interaction. We demonstrate that the effect of interaction of the electron with other electrons and lattice ions in a disordered metal is equivalent to that of an effective dissipative environment. Quantum noise of this environment causes quantum decoherence even at T = 0. Our analysis explicitely accounts for the Pauli principle which plays an important role for inelastic scattering processes but turns out not to affect quantum decoherence. Our results seriously challenge the existence of strong localization in low dimensional disordered metals.
Databáze:	OpenAIRE
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