activity
20182026
most citedSuperfluorescence, free-induction decay, and four-wave mixing: propagation of free-electron laser pulses through a dense sample of helium ions

33 citations · 55 across the 6 of their papers we have counts for

collaborators

6 papers

math-ph2026

Big Crunch on Julia and Anti-Julia Sets in the Integrable Limit

Masatomi Iizawa, Satoru Saito, Yasuhito Narita +3

The Julia set is defined by the closure of repelling periodic points in chaotic systems. Why does this structure not appear in integrable systems? In this paper, we address this qu…

physics.atom-ph2025

Scattering Angle Dependence of Fano Resonance Profiles in Cold Atomic Collisions Analyzed with the Complex Valued Parameter

Tanmay Singh, Raj Aryan Singh, Fumihiro Koike +2

The scattering angle dependence of Fano resonance profiles in cold atomic collisions has been theoretically studied. A complex-valued parameter with an analytical formula des…

astro-ph.SR2025

Nonlocal Evolution of Magnetic Helicity across the Magnetohydrodynamic-Kinetic Interface

Masatomi Iizawa, Yasuhito Narita, Tommaso Alberti +6

Magnetic helicity is typically indistinguishable from noise in the solar wind inertial range. Using Parker Solar Probe measurements (0.1-0.8 au), we report a robust bihelical struc…

quant-ph2020

Dynamic Logic of Quantum Field Theory

Tsubasa Takagi, Hiroki Hoshina, Masatomi Iizawa +1

Although logic of quantum mechanics has been studied for a long time, logic of QFT has not been studied before. We formulate logic of QFT by introducing the perspective of dynamic…

physics.atom-ph2018★ 22 cited

The quantum and classical Fano parameter

Masatomi Iizawa, Satoshi Kosugi, Fumihiro Koike +1

The Fano resonance has been a familiar and important feature in atomic and molecular physics for more than half a century. Typically, the combination of a discrete state with one o…

physics.atom-ph2018★ 33 cited

Superfluorescence, free-induction decay, and four-wave mixing: propagation of free-electron laser pulses through a dense sample of helium ions

James R Harries, Hiroshi Iwayama, Susumu Kuma +9

We report an experimental and numerical study of the propagation of free-electron laser pulses (wavelength 24.3 nm) through helium gas. Ionisation and excitation populates the He$^…