13 citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
6 papers
Decay of a scalar condensate in two different approaches
Ayuki Kamada, Kodai Sakurai
Decay of a scalar condensate via interactions with (quasi-)particles is of interest to many fields in physics, including cosmology. In cosmology, the decay of an inflaton condensat…
Pointcheval-Sanders Signature-Based Synchronized Aggregate Signature
Masayuki Tezuka, Keisuke Tanaka
Synchronized aggregate signature is a special type of signature that all signers have a synchronized time period and allows aggregating signatures which are generated in the same p…
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…
Thermal resonating Hartree-Bogoliubov theory based on the projection method
Seiya Nishiyama, Joao da Providencia, Hiromasa Ohnishi
We propose a rigorous thermal resonating mean-field theory (Res-MFT). A state is approximated by superposition of multiple MF wavefunctions (WFs) composed of non-orthogonal Hartree…