Magneto-optical signature of massless Kane electrons in Cd3As2
A. Akrap, M. Hakl, S. Tchoumakov, I. Crassee, J. Kuba, M. O. Goerbig,, C. C. Homes, O. Caha, J. Novak, F. Teppe, W. Desrat, S. Koohpayeh, Liang Wu,, N. P. Armitage, A. Nateprov, E. Arushanov, Q. D. Gibson, R. J. Cava, D. van, der Marel, B. A. Piot, C. Faugeras, G. Martinez
TL;DR
This study uses optical reflectivity to identify massless Kane electrons in Cd3As2, distinguishing them from Dirac electrons through cyclotron resonance in magnetic fields.
Contribution
It provides experimental evidence of massless Kane electrons in Cd3As2 via magneto-optical measurements, clarifying their distinct optical signatures.
Findings
Detection of 3D massless charge carriers
Cyclotron resonance indicates Kane electrons
Distinction from Dirac electrons
Abstract
We report on optical reflectivity experiments performed on Cd3As2 over a broad range of photon energies and magnetic fields. The observed response clearly indicates the presence of 3D massless charge carriers. The specific cyclotron resonance absorption in the quantum limit implies that we are probing massless Kane electrons rather than symmetry-protected 3D Dirac particles. The latter may appear at a smaller energy scale and are not directly observed in our infrared experiments.
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