Antiresonances as precursors of decoherence

L. E.F. Foa Torres, H. M. Pastawski, E. Medina

Producción científica: Contribución a una revistaArtículorevisión exhaustiva

23 Citas (Scopus)

Resumen

We show that, in the presence of a complex spectrum, antiresonances act as a precursor for dephasing enabling the crossover to a fully decoherent transport even within a unitary Hamiltonian description. This general scenario is illustrated here by focusing on a quantum dot coupled to a chaotic cavity containing a finite, but large, number of states using a Hamiltonian formulation. For weak coupling to a chaotic cavity with a sufficiently dense spectrum, the ensuing complex structure of resonances and antiresonances leads to phase randomization under coarse graining in energy. Such phase instabilities and coarse graining are the ingredients for a mechanism producing decoherence and thus irreversibility. For the present simple model one finds a conductance that coincides with the one obtained by adding a ficticious voltage probe within the Landauer-Büttiker picture. This sheds new light on how the microscopic mechanisms that produce phase fluctuations induce decoherence.

Idioma originalInglés
Páginas (desde-hasta)164-170
Número de páginas7
PublicaciónEurophysics Letters
Volumen73
N.º2
DOI
EstadoPublicada - 15 ene. 2006
Publicado de forma externa

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