Dresden 2003 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 12: Mesoskopische Systeme II

TT 12.1: Vortrag

Mittwoch, 26. März 2003, 14:30–15:00, HSZ03

Plasmon-assisted tunneling in Luttinger quantum dots — •M. Thorwart, M. Grifoni, H.W.Ch. Postma, and C. Dekker — Department of NanoScience, Technische Universiteit Delft, The Netherlands

We investigate correlated charge transport in a one-dimensional interacting quantum dot at low temperatures and take into account the finite range of the screened Coulomb interaction. For linear transport, we identify a regime of low temperature and strong repulsive interaction, where correlated sequential tunneling determines the temperature dependence of the conductance maximum [1]. Additional interesting consequences are discussed in this talk. Correlated sequential tunneling generates side peaks associated to the main Coulomb peak due to plasmon-assisted tunneling, in close analogy to photon-assisted tunneling. The side peaks allow the observation of spin-charge separation, probably the most exceptional feature of a Luttinger liquid. Our theoretical predictions are discussed in the context of experimental results [2] obtained from intramolecular quantum dots designed in metallic single-walled carbon nanotubes.

[1] M. Thorwart, M. Grifoni, G. Cuniberti, H. Postma, and C. Dekker, Phys. Rev. Lett. 89, 196402 (2002)

[2] H. W. Ch. Postma, T. Teepen, Zh. Yao, M. Grifoni, und C. Dekker, Science 293, 76 (2001)