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Berry phase and band structure analysis of the Weyl semimetal NbP

MPG-Autoren
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Shekhar,  Chandra
Chandra Shekhar, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Felser,  Claudia
Claudia Felser, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Yan,  Binghai
Binghai Yan, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;
Max Planck Institute for the Physics of Complex Systems, Max Planck Society;

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Zitation

Sergelius, P., Gooth, J., Baessler, S., Zierold, R., Wiegand, C., Niemann, A., et al. (2016). Berry phase and band structure analysis of the Weyl semimetal NbP. Scientific Reports, 6: 33859, pp. 1-6. doi:10.1038/srep33859.


Zitierlink: https://hdl.handle.net/11858/00-001M-0000-002B-9FC6-2
Zusammenfassung
Weyl semimetals are often considered the 3D-analogon of graphene or topological insulators. The evaluation of quantum oscillations in these systems remains challenging because there are often multiple conduction bands. We observe de Haas-van Alphen oscillations with several frequencies in a single crystal of the Weyl semimetal niobium phosphide. For each fundamental crystal axis, we can fit the raw data to a superposition of sinusoidal functions, which enables us to calculate the characteristic parameters of all individual bulk conduction bands using Fourier transform with an analysis of the temperature and magnetic field-dependent oscillation amplitude decay. Our experimental results indicate that the band structure consists of Dirac bands with low cyclotron mass, a non-trivial Berry phase and parabolic bands with a higher effective mass and trivial Berry phase.