61 citations · 197 across the 18 of their papers we have counts for
18 papers
Real Time Quantum Dynamics of Spontaneous Translational Symmetry Breakage in the Early Stage of Photo-induced Structural Phase Transitions
Keiichiro Nasu
Real time quantum dynamics of the spontaneous translational symmetry breakage in the early stage of photoinduced structural phase transitions is reviewed and supplementally explain…
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…
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…
Proposal of Two-Pulse Excitation to Efficiently Photoinduced Novel Nano Domain with Frozen Shear in Graphite Crystal
Keita Nishioka, Keiichiro Nasu, Kenji Yonemitsu
We propose a two-pulse excitation to efficiently photoinduced a novel -bonded nano-domain with a frozen shear in a graphite crystal. This structure is known to be well…
The dynamics of a qubit in a spin-boson environment: a comparison between analytical and numerical method
Peihao Huang, Hang Zheng, Keiichiro Nasu
The dynamics of a qubit under the decoherence of a two level fluctuator (TLF) in addition to its coupling to a bosonic bath is investigated theoretically. Two different methods are…