Journalartikel

Jahr der Veröffentlichung: 2007

Zeitschrift: Physical review A

Bandnummer: 75

Heftnummer: 6

ISSN: 1050-2947

eISSN: 1094-1622

DOI Link: https://doi.org/10.1103/PhysRevA.75.062115

Verlag: American Physical Society

Abstract: 
Based on a master equation for the reduced density matrix of an open quantum collective system, the influence of coordinate-dependent microscopical diffusion coefficients on the decay rate from a metastable state is treated. For various frictions and temperatures larger than a crossover temperature, the quasistationary decay rates obtained with the coordinate-dependent microscopical set of diffusion coefficients are compared with those obtained with the coordinate-independent microscopical set of diffusion coefficients and coordinate-independent and -dependent phenomenological sets of diffusion coefficients. Neglecting the coordinate dependence of diffusion coefficients, one can strongly overestimate or underestimate the decay rate at low temperature. The coordinate-dependent phenomenological diffusion coefficient in momentum are shown to be suitable for applications.

Harvard-Zitierstil: Sargsyan, V., Palchikov, Y., Kanokov, Z., Adamian, G. and Antonenko, N. (2007) Coordinate-dependent diffusion coefficients: Decay rate in open quantum systems, PHYSICAL REVIEW A, 75(6), Article 062115. https://doi.org/10.1103/PhysRevA.75.062115

APA-Zitierstil: Sargsyan, V., Palchikov, Y., Kanokov, Z., Adamian, G., & Antonenko, N. (2007). Coordinate-dependent diffusion coefficients: Decay rate in open quantum systems. PHYSICAL REVIEW A. 75(6), Article 062115. https://doi.org/10.1103/PhysRevA.75.062115