[16p-A32-1~14] 3.1 Basic optics and frontier of optics

5:00 PM - 5:15 PM JST(8:00 AM - 8:15 AM UTC)

[16p-A32-14] Changes in optical response due to crystal-crystal phase transition of MnTe film

〇Haruyuki Sano¹, Masashi Kuwahara², Hitoshi Kawashima², Hiroyuki Tsuda³, Goro Mizutani⁴, Toshu An⁴ (1.NIT Ishikawa College, 2.AIST, 3.Keio Univ., 4.JAIST)

Keywords:

optical response,Phase transition,MnTe

In order to understand the mechanism of changes in optical response due to phase transition of MnTe, we performed ab-initio calculations of alpha- and beta-MnTe crystals. The calculated results of imaginary part of optical refractive index indicated that the rise of optical absorption shifted approximately 1 eV to the higher energy side due to the phase transition from alpha to beta. This is because the nearest neighbor distance between Mn atom and Te atom is shorter in the beta phase, and the interactions between these two atoms become larger, resulting in an increased band gap and a larger optical transition energy.