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

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WYZULA Jan LU Xin SANTOS-COTTIN David MUKHERJEE Dibya Kanti MOHELSKY Ivan FLORIAN Le Mardele NOVÁK Jiří NOVAK Mario SANKAR Raman KRUPKO Yuriy PIOT Benjamin A LEE Wei-Li AKRAP Ana POTEMSKI Marek GOERBIG Mark O ORLITA Milan

Rok publikování 2022
Druh Článek v odborném periodiku
Časopis / Zdroj Advanced Science
Fakulta / Pracoviště MU

Přírodovědecká fakulta

Citace
www https://onlinelibrary.wiley.com/doi/10.1002/advs.202105720
Doi http://dx.doi.org/10.1002/advs.202105720
Klíčová slova dirac and topological matter; infrared magneto-spectroscopy; Landau level spectroscopy; Lorentz boost; nodal-line semimetals
Popis 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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