Lorentz-Boost-Driven Magneto-Optics in a Dirac Nodal-Line Semimetal
Author
Wyzula, Jan
Lu, Xin
Santos-Cottin, David
Mukherjee, Dibya Kanti
Mohelský, Ivan
Le Mardelé, Florian
Novák, Jiří
Novak, Mario
Sankar, Raman
Krupko, Yuriy
Piot, Benjamin A.
Lee, Wei Li
Akrap, Ana
Potemski, Marek
Goerbig, Mark O.
Publication date
2022Published in
Advanced ScienceVolume / Issue
9 (23)ISBN / ISSN
ISSN: 2198-3844Metadata
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This publication has a published version with DOI 10.1002/advs.202105720
Abstract
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 it is shown 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 behavior is explained in terms of band-gap renormalization driven by Lorentz boosts which results from the Lorentz-covariant form of the Dirac Hamiltonian relevant for the nodal line at low energies.
Keywords
dirac and topological matter, infrared magneto-spectroscopy, Landau level spectroscopy, Lorentz boost, nodal-line semimetals
Permanent link
https://hdl.handle.net/20.500.14178/2221License
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