Regensburg 2016 – scientific programme
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O: Fachverband Oberflächenphysik
O 100: Topological Insulators II
O 100.4: Talk
Friday, March 11, 2016, 10:15–10:30, H15
Optical investigation of the three-dimensional Dirac semimetals CaMnBi2 and SrMnBi2 — •Micha B. Schilling1, Artem V. Pronin1, Martin Dressel1, and Youguo Shi2 — 11. Physikalisches Institut, Universität Stuttgart, 70569 Stuttgart, Germany — 2Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, 100190 Beijing, China
The interest in the measurements of optical conductivity in three-dimensional Dirac semimetals is based on the recent theoretical studies [1, 2], where the interband optical response of such systems has been shown to be very peculiar. Namely, the real part of the interband optical conductivity has been predicted to be linear in frequency with the slope being related to the Fermi velocity of Dirac electrons.
We investigated the optical properties of the three-dimensional Dirac semimetals CaMnBi2 and SrMnBi2 by means of Fourier-transform infrared spectroscopy. We measured the reflectivity over a frequency range from 50 to 25000 cm−1 at different temperatures down to 10 K and determined the optical conductivity from these measurements. In the presentation, we will discuss our results on the optical conductivity in comparison with theoretical predictions.
[1] P. Hosur, S. A. Parameswaran, and A. Vishwanath, Phys. Rev. Lett. 108, 046602 (2012). [2] A. Bácsi and A. Virosztek, Phys. Rev. B 87, 125425 (2013).