Magneto-Optical Signature of Massless Kane Electrons in Cd3As2
ORAL
Abstract
We report on infrared magneto-specroscopy of Cd$_3$As$_2$. 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 [1]. The latter may appear at a smaller energy scale and are not directly observed in our infrared experiments. This our conclusion is fully consistent with the simple Bodnar model developed in the past to describe the Cd$_3$As$_2$ band structure [2]. References: [1] A. Akrap et al., Phys. Rev. Lett. 117, 136401 (2016) [2] J. Bodnar et al., Proc. of Narrow Gap Semicond. Conf., Warsaw, 1977, p. 311.
