[12a-B415-1~8] 3.6 Ultrashort-pulse and high-intensity lasers

[12a-B415-2] Imaging the Inhomogeneity of Topological Surface State with Time, Space, and Energetic Resolutions

〇Keiki Fukumoto¹, Yusuke Fukami², Daisuke Shiga³, Hiroshi Kumigashira³, Shin-ya Koshihara⁴, Shin-ichi Adachi¹ (1.KEK, 2.Tsukuba Univ., 3.Tohoku Univ., 4.Tokyo tech.)

Keywords:Topological insulator, photoemission spectroscopy, Imaging

Three dimensional topological insulator (TI) is insulator in the bulk, but exhibit Dirac surface states (SS). However, the SS is susceptible to contaminations and spectroscopic studies predict that the SS appears inhomogeneously on the surface. We have visualized the inhomogeneity on a typical 3D TI Bi₂Se₃ surface using femtosecond photoemission electron microscopy which has time, space, and energy resolutions.