Berlin 2024 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 26: Nanotubes and Nanoribbons

TT 26.1: Vortrag

Dienstag, 19. März 2024, 09:30–09:45, H 3007

Electronic transport in bent carbon nanotubes — Eric Kleinherbers^{1, 2}, Thomas Stegmann³, and •Nikodem Szpak¹ — ¹Faculty of Physics and CENIDE, University of Duisburg-Essen, 47057 Duisburg, Germany — ²Department of Physics and Astronomy, University of California, Los Angeles, California 90095, USA — ³Instituto de Ciencias Físicas, Universidad Nacional Autónoma de México, 62210 Cuernavaca, Mexico

We study the electronic transport through uniformly bent carbon nanotubes. For this purpose, we describe the nanotube with the tight-binding model and calculate the local current flow by employing nonequilibrium Green’s functions (NEGF) in the Keldysh formalism. In addition, we describe the low-energy excitations using an effective Dirac equation in curved space with a strain-induced pseudomagnetic field, which can be solved analytically for the torus geometry in terms of the Mathieu functions. We obtain a perfect quantitative agreement with the NEGF results. For nanotubes with an armchair edge, already a weak bending of 1

[1] E. Kleinherbers, T. Stegmann, N. Szpak, Phys. Rev. B 107 (2023) 195424

Keywords: carbon nanotubes; strain; pseudomagnetic field; Dirac equation; electronic transport