Lorentz-boost-driven magneto-optics in a Dirac nodal-line semimetal

Optical response of crystalline solids is to a large extent driven by excitations that promote electrons among individual bands. This allows one to apply optical and magneto-optical methods to determine experimentally the energy band gap - a fundamental property crucial to our understanding of any s...

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Bibliographic Details
Published in:arXiv.org 2022-07
Main Authors: Wyzula, J, X Lu, Santos-Cottin, D, Mukherjee, D K, Mohelsky, I, F Le Mardele, Novak, J, Novak, M, Sankar, R, Krupko, Y, Piot, B A, W -L Lee, Akrap, A, Potemski, M, Goerbig, M O, Orlita, M
Format: Article
Language:English
Subjects:
Crystal structure
Energy bands
Energy gap
Magneto-optics
Metalloids
Optics
Online Access:Get full text
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Summary:Optical response of crystalline solids is to a large extent driven by excitations that promote electrons among individual bands. This allows one to apply optical and magneto-optical methods to determine experimentally the energy band gap - a fundamental property crucial to our understanding of any solid - with a great precision. Here we show that such conventional methods, applied with great success to many materials in the past, do not work in topological Dirac semimetals with a dispersive nodal line. There, the optically deduced band gap depends on how the magnetic field is oriented with respect to the crystal axes. Such highly unusual behaviour is explained in terms of band-gap renormalization driven by Lorentz boosts.
ISSN:2331-8422
DOI:10.48550/arxiv.2110.07266