Regensburg 2016 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 54: Transport: Carbon Nanotubes
TT 54.6: Vortrag
Mittwoch, 9. März 2016, 16:15–16:30, H22
Mode splitting in zig-zag carbon nanotubes — Jhon González1, Gilles Buchs2, •Dario Bercioux3,4, and Andres Ayuela1,3 — 1Centro de Física de Materiales (CFM-MPC) Centro Mixto CSIC-UPV/EHU, E-20018 Donostia-San Sebastián, Spain — 2Centre Suisse d’Electronique et de Microtechnique (CSEM) SA, Rue de l’Observatoire 58, CH-2002 Neuchâtel, Switzerland — 3Donostia International Physics Center (DIPC), E-20018 Donostia-San Se- bastián, Spain — 4IKERBASQUE, Basque Foundation of Science, E-48011 Bilbao, Spain
We investigate theoretically the electron scattering properties of defected and free-standing zig-zag single-walled carbon nanotubes. The variation of the chemical potential, realized in the suspended region, produces quasi-bound states, which compete with the ones created by multiple defects [1]. We show that a particular configuration of the tube defects produces a degeneracy lifting in the metallic branches of the nanotube. As a consequence we observe a doubling or splitting of the quasi-bound states. We also observe a particle-hole symmetry breaking due to selection rules associated to the interplay of tube and defects [2]. Our predictions are supported by an experimental case where a partially suspended zig-zag tube shows split quasi-bound states between defects induced by Ar+ ions [1] Our results find applications in angular momentum filtering as well as in THz optics. [3].
[1] D. Bercioux et al., Phys. Rev. B 83, 165439 (2011).
[2] L. Mayrhofer and D. Bercioux, Phys. Rev. B 84, 115126 (2011).
[3] J. González et al., submitted.