13 citations · 22 across the 4 of their papers we have counts for
4 papers
Direct Determination of Exciton Wave Function Amplitudes by the Momentum-Resolved Photo-Electron Emission Experiment
Hiromasa Ohnishi, Norikazu Tomita, Keiichiro Nasu
We study conceptional problems of a photo-electron emission (PEE) process from a free exciton in insulating crystals. In this PEE process, only the electron constituting the excito…
Instantaneous Intervalley Transition just at the Franck-Condon State in the Conduction Band of GaAs
Hiromasa Ohnishi, Norikazu Tomita, Keiichiro Nasu
We propose two possible quantum microscopic mechanisms for intervalley transitions just at the Franck-Condon state in GaAs. The first is the simultaneously combined coulombic elast…
Interplay between disorder and inversion symmetry: Extreme enhancement of the mobility near the Weyl point in BiTeI
M. Sasaki, Kyoung-Min Kim, A. Ohnishi +5
We show experimental and theoretical evidence that BiTeI hosts a novel disordered metallic state named diffusive helical Fermi liquid (DHFL), characterized by a pair of concentric…
Real time relaxation dynamics of macroscopically photo-excited electrons toward the Fermi degeneracy formation in the conduction band of semiconductors
Hiromasa Ohnishi, Norikazu Tomita, Keiichiro Nasu
Concerning with the recent experiment of time-resolved two-photon photo-emission spectral measurements on semiconductors (GaAs, InP), we theoretically study real time relaxation dy…