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journal article·2022-08Open access

Lorentz‐Boost‐Driven Magneto‐Optics in a Dirac Nodal‐Line Semimetal

Jan Wyzula, Xin Lu, David Santos‐Cottin, Dibya Kanti Mukherjee, Ivan Mohelský, Florian Le Mardelé, Jiří Novák, Mario Novak, Raman Sankar, Yuriy Krupko, Benjamin A. Piot, Wei‐Li Lee, Ana Akrap, Marek Potemski, Mark O. Goerbig, Milan Orlita

Advanced Science· Volume 9· Issue 23
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Abstract

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.
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Research context

OpenAlex topics: Topological Materials and Phenomena · Graphene research and applications · Quantum Mechanics and Non-Hermitian Physics

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Affiliations

LNCMI‐CNRS UPR3228, Université Grenoble Alpes, Université Toulouse 3 INSA Toulouse EMFL 25 rue des Martyrs, BP166 Grenoble Cedex 9 38042 France

Laboratoire de Physique des Solides Université Paris Saclay CNRS UMR 8502 Orsay Cedex 91405 France

Department of Physics University of Fribourg Chemin du Musée 3 Fribourg 1700 Switzerland

Department of Physics Indiana University Bloomington IN 47405 USA

Department of Condensed Matter Physics Masaryk University Kotlářská 2 611 37 Brno Czech Republic

Department of Physics Faculty of Science University of Zagreb Zagreb 10000 Croatia

Institute of Physics Academia Sinica Nankang Taipei 11529 Taiwan

Institut d'Electronique et des Systemes CNRS, UMR 5214, Université de Montpellier Montpellier 34000 France

Institute of Experimental Physics Faculty of Physics University of Warsaw ul. Pasteura 5 Warszawa 02‐093 Poland

Institute of Physics Faculty of Mathematics and Physics Charles University Ke Karlovu 5 121 16 Prague 2 Czech Republic

Funding

Agence Nationale de la Recherche · Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung · Ministry of Science and Technology · National Science Foundation

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