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.
@article{arxiv.1604.00038,
title = {Magneto-optical signature of massless Kane electrons in Cd3As2},
author = {A. Akrap and M. Hakl and S. Tchoumakov and I. Crassee and J. Kuba and M. O. Goerbig and C. C. Homes and O. Caha and J. Novak and F. Teppe and W. Desrat and S. Koohpayeh and Liang Wu and N. P. Armitage and A. Nateprov and E. Arushanov and Q. D. Gibson and R. J. Cava and D. van der Marel and B. A. Piot and C. Faugeras and G. Martinez and M. Potemski and M. Orlita},
journal= {arXiv preprint arXiv:1604.00038},
year = {2016}
}
Comments
5 pages, 4 figures + supplementary materials (17 pages), to be published in Phys. Rev. Lett