Dresden 2020 – wissenschaftliches Programm
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TT 27.5: Vortrag
Dienstag, 17. März 2020, 15:00–15:15, HSZ 103
Magneto-optical study of the Dirac semimetal Cd3As2 in Voigt geometry — •Seulki Roh1, Ece Uykur1, Tobias Biesner1, Lucky Maluna1, Alex Nateprov2, Martin Dressel1, and Artem Pronin1 — 11. Physikalisches Institut, Universität Stuttgart, 70569 Stuttgart, Germany — 2Institute of Applied Physics, Academy of Sciences of Moldova, Academiei str. 5, 2028 Chisinau, Moldova
The three-dimensional Dirac semimetals possess Dirac points, which can be considered as a superposition of two Weyl points in reciprocal space. Under a magnetic field, the spin degeneracy can be lifted and a pair of Weyl points with opposite chiralities connected by a zeroth Landau level appears, enabling the charge transfer between the two Weyl points - the so-called chiral pumping effect. In this study, Cd3As2 was investigated by optical spectroscopy under external static magnetic field, B. The Voigt geometry was employed to parallelize the electric field of incident light, E, and the static magnetic field. In the E perpendicular to B configuration, we observed a pronounced Voigt resonance due to the splitting of the plasma edge. In the E ∥ B geometry, we detected an increase of the Drude spectral weight, which could be caused by the chiral pumping effect. In the talk, we will discuss the possible relation between this effect and our observations in more detail.