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Article

Fractional Power-Law Intraband Optical Conductivity in the Low-Dimensional Dirac Material CaMnBi2

1
Physikalisches Institut, Universität Stuttgart, 70569 Stuttgart, Germany
2
Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
3
Max-Planck-Institut für Festkörperforschung, 70569 Stuttgart, Germany
*
Author to whom correspondence should be addressed.
Academic Editor: Andreas Hermann
Crystals 2021, 11(4), 428; https://doi.org/10.3390/cryst11040428
Received: 30 March 2021 / Revised: 9 April 2021 / Accepted: 13 April 2021 / Published: 16 April 2021
(This article belongs to the Special Issue Advances in Topological Materials)
We studied the broadband optical conductivity of CaMnBi2, a material with two-dimensional Dirac electronic bands, and found that both components of the intraband conductivity follow a universal power law as a function of frequency at low temperatures. This conductivity scaling differs from the Drude(-like) behavior, generally expected for free carriers, but matches the predictions for the intraband response of an electronic system in a quantum critical region. Since no other indications of quantum criticality are reported for CaMnBi2 so far, the cause of the observed unusual scaling remains an open question. View Full-Text
Keywords: Dirac materials; optical-conductivity scaling; topological semimetals Dirac materials; optical-conductivity scaling; topological semimetals
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MDPI and ACS Style

Schilling, M.B.; Wang, C.X.; Shi, Y.G.; Kremer, R.K.; Dressel, M.; Pronin, A.V. Fractional Power-Law Intraband Optical Conductivity in the Low-Dimensional Dirac Material CaMnBi2. Crystals 2021, 11, 428. https://doi.org/10.3390/cryst11040428

AMA Style

Schilling MB, Wang CX, Shi YG, Kremer RK, Dressel M, Pronin AV. Fractional Power-Law Intraband Optical Conductivity in the Low-Dimensional Dirac Material CaMnBi2. Crystals. 2021; 11(4):428. https://doi.org/10.3390/cryst11040428

Chicago/Turabian Style

Schilling, M. B., C. X. Wang, Y. G. Shi, R. K. Kremer, M. Dressel, and A. V. Pronin 2021. "Fractional Power-Law Intraband Optical Conductivity in the Low-Dimensional Dirac Material CaMnBi2" Crystals 11, no. 4: 428. https://doi.org/10.3390/cryst11040428

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