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Phonon-induced magnetoresistivity of Weyl semimetal nanowires

De Martino, A. ORCID: 0000-0002-3656-0419, Dorn, K., Buccheri, F. and Egger, R. (2021). Phonon-induced magnetoresistivity of Weyl semimetal nanowires. Physical Review B, 104(15), 155425. doi: 10.1103/PhysRevB.104.155425

Abstract

We study longitudinal magnetotransport in disorder-free cylindrical Weyl semimetal nanowires. Our theory includes a magnetic flux φ piercing the nanowire and captures the finite curvature of the Fermi arc in the surface Brillouin zone through a boundary angle α. Electron backscattering by acoustic phonons via the deformation potential causes a finite resistivity which we evaluate by means of the semiclassical Boltzmann approach. We find that low-energy transport is dominated by surface states, where transport observables are highly sensitive to the angle α and to Aharonov-Bohm phases due to φ. A generic subband dispersion relation allows for either one or two pairs of Fermi points. In the latter case, intranode backscattering is possible and implies a parametrically larger resistivity than for a single Fermi point pair. As a consequence, large and abrupt resistivity changes take place across the transition points separating parameter regions with a different number of Fermi point pairs in a given subband.

Publication Type: Article
Subjects: Q Science > QC Physics
T Technology > TK Electrical engineering. Electronics Nuclear engineering
Departments: School of Mathematics, Computer Science & Engineering > Mathematics
Project Input:
Project IDFunder NameFunder ID
EG 96/12-1Deutsche Forschungsgemeinschafthttp://dx.doi.org/10.13039/501100001659
Date available in CRO: 24 Nov 2021 12:08
Date deposited: 23 November 2021
Date of acceptance: 8 October 2021
Date of first online publication: 19 October 2021
URI: https://openaccess.city.ac.uk/id/eprint/27127
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