Página Inicial CNEA Laboratorio TANDAR Página Inicial TANDAR Historia del acelerador TANDAR Web interno Web mail
Inicio » Actividades I+D > Publicaciones 2002 > Numerical Study of Quasiparticle Lifetim...
artículo con referato
"Numerical Study of Quasiparticle Lifetime in Quantum Dots"
A.M.F. Rivas, E.R. Mucciolo and A. Kamenev
Phys. Rev. B 65(15) (2002) 155309/1-8
Abstract
The decay rate of quasiparticles in quantum dots is studied through the real time calculation of the single-particle Green function in the self-consistent approximation. The method avoids exact diagonalization, transforming the problem into a system of coupled non-linear integral equations which may be solved iteratively. That allows us to study systems larger than previously treated in the literature. Our results for the inverse participation ratio of many-body states show that the threshold energy for the quasiparticle disintegration is E*~sqrt(gΔ). The delocalization transition is soft rather than sharp. Three different regimes as function of the effective interaction strength may be clearly identified at high energies.
DIVISION FISICA TEORICA
Contacto
Av. Gral Paz y Constituyentes, San Martín, Pcia. de Buenos Aires, Argentina
Tel: (54-11) 6772-7007 - Fax: (54-11) 6772-7121