Resonant tunneling in a Luttinger liquid for arbitrary barrier transmissionS. Hügle and R. Egger
Institut für Theoretische Physik, Heinrich-Heine-Universität D-40225 Düsseldorf, Germany
(Received 8 December 2003; accepted in final form 4 March 2004)
A numerically exact dynamical quantum Monte Carlo approach has been developed and applied to transport through a double barrier in a Luttinger liquid with arbitrary transmission. For strong transmission, we find broad Fabry-Pérot Coulomb-blockade peaks, with a lineshape parametrized by a single parameter, but at sufficiently low temperatures, non-Lorentzian universal lineshapes characteristic of coherent resonant tunneling emerge, even for strong interactions. For weak transmission, our data supports the recently proposed correlated sequential tunneling picture and is consistent with experimental results on intrinsic nanotube dots.
71.10.Pm - Fermions in reduced dimensions (anyons, composite fermions, Luttinger liquid, etc.).
73.23.Hk - Coulomb blockade; single-electron tunneling.
73.40.Gk - Tunneling.
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