title: Secondary Electron Interference from Trigonal Warping in Clean Carbon Nanotubes.
abstract: We investigate Fabry-Perot interference in an ultraclean carbon nanotube resonator. The conductance shows a clear superstructure superimposed onto conventional Fabry-Perot oscillations. A sliding average over the fast oscillations reveals a characteristic slow modulation of the conductance as a function of the gate voltage. We identify the origin of this secondary interference in intervalley and intravalley backscattering processes which involve wave vectors of different magnitude, reflecting the trigonal warping of the Dirac cones. As a consequence, the analysis of the secondary interference pattern allows us to estimate the chiral angle of the carbon nanotube.
authors: Institute for Experimental and Applied Physics, University of Regensburg, 93040 Regensburg, Germany.|Institute for Theoretical Physics, University of Regensburg, 93040 Regensburg, Germany.
authors: A
authors: A
authors: Dirnaichner
authors: Institute for Theoretical Physics, University of Regensburg, 93040 Regensburg, Germany.
authors: M
authors: M
authors: Del Valle
authors: Institute for Experimental and Applied Physics, University of Regensburg, 93040 Regensburg, Germany.
authors: K J G
authors: KJ
authors: Götz
authors: Institute for Experimental and Applied Physics, University of Regensburg, 93040 Regensburg, Germany.
authors: F J
authors: FJ
authors: Schupp
authors: Institute for Experimental and Applied Physics, University of Regensburg, 93040 Regensburg, Germany.
authors: N
authors: N
authors: Paradiso
authors: Institute for Theoretical Physics, University of Regensburg, 93040 Regensburg, Germany.
authors: M
authors: M
authors: Grifoni
authors: Institute for Experimental and Applied Physics, University of Regensburg, 93040 Regensburg, Germany.
authors: Ch
authors: C
authors: Strunk
authors: Institute for Experimental and Applied Physics, University of Regensburg, 93040 Regensburg, Germany.
authors: A K
authors: AK
authors: Hüttel