Electron injection in a nanotube with leads: finite frequency noise-correlations and anomalous charges

Andrei V. Lebedev (1) , Adeline Crépieux (2, 3, 4) , Thierry Martin (3, 4)

1 L.D. Landau Institute for Theoretical Physics of RAS
2 CPT - E6 Nanophysique
3 CPT - Centre de Physique Théorique - UMR 6207
4 CPT - Centre de Physique Théorique - UMR 7332

The non-equilibrium transport properties of a carbon nanotube which is connected to Fermi liquid leads, where electrons are injected in the bulk, are computed. A previous work which considered an infinite nanotube showed that the zero frequency noise correlations, measured at opposite ends of the nanotube, could be used to extract the anomalous charges of the chiral excitations which propagate in the nanotube. Here, the presence of the leads have the effect that such-noise cross-correlations vanish at zero frequency. Nevertheless, information concerning the anomalous charges can be recovered when considering the spectral density of noise correlations at finite frequencies, which is computed perturbatively in the tunneling amplitude. The spectrum of the noise cross-correlations is shown to depend crucially on the ratio of the time of flight of quasiparticles traveling in the nanotube to the ``voltage\'\' time which defines the width of the quasiparticle wave-packets injected when an electron tunnels. Potential applications toward the measurement of such anomalous charges in non-chiral Luttinger liquids (nanotubes or semiconductor quantum wires) are discussed.

Domaines: Electrons fortement corrélés [cond-mat.str-el]

Andrei V. Lebedev, Adeline Crépieux, Thierry Martin. Electron injection in a nanotube with leads: finite frequency noise-correlations and anomalous charges. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2005, 71, pp.075416. ⟨10.1103/PhysRevB.71.075416⟩. ⟨hal-00004471⟩