Numerical study of quasiparticle lifetime in quantum dots

Alejandro M. Rivas, Eduardo R. Mucciolo, Alex Kamenev

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

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*∼√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.

Original languageEnglish (US)
Article number155309
Pages (from-to)1553091-1553098
Number of pages8
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume65
Issue number15
DOIs
StatePublished - Apr 15 2002

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