Interference pattern formation between bound solitons and radiation in momentum space; Possible detection of radiation from bound solitons with Bose-Einstein condensate of neutral atoms

Fujishima, Hironobu*; Okumura, Masahiko; Mine, Makoto*; Yajima, Tetsu*

Journal of the Physical Society of Japan, 81(10), p.104003_1 - 104003_7, 2012/10

https://doi.org/10.1143/JPSJ.81.104003

We propose an indirect method for observing radiation from an incomplete soliton with a sufficiently large amplitude. We show that the radiation causes a notched structure on the envelope of the wave packet in the momentum space. The origin of this structure is the interference between the main body of oscillating solitons and the small radiation in the momentum space. We numerically integrate the nonlinear Schrdinger equation and perform Fourier transformation to confirm that the predicted structure really appears. We also show a simple model which reproduces the qualitative result. The experimental detection of the notched structure with the Bose-Einstein condensation of neutral atoms is discussed and suitable parameters for this detection experiment are shown.