Two-Component Interference Effect

P. Středa, A. Vyhnal, Petr Šeba

M.L. Yan

The interference effect between the neutron spinor components is investigated. It is shown that the diffusion of the neutron wave-packet under an unhomogeneous magnetic field is related to the phase shift angle between the two spinor components. We propose that this effect could be used to detect the phase-shift of a coherent neutron beam having passed through some medium. In the interference experiment based upon this principle one will not need to use Bragg reflection from crystal planes for splitting and recombining the beam, and the dimension of the phase shift region will be much longer than that of the usual Bonse-Kart type neutron interferometer.

John Ewan Inglesfield

JOHN WYLIE

S P Goreslavsky, В.Д. Попов

The influence of the phase difference of the components of a bichromatic field on the dynamics of a two-level atom is studied in the framework of an analytical approach. We give a new, more adequate explanation of an experiment [R. E. Silverano et al., Phys. Rev. Lett. 55, 1070 (1985)] where strong phase effects were observed in the interaction of a fast atomic beam with a standing-wave field. It was shown that these effects are caused by interference of contributions of components of the bichromatic field in the amplitude of the upper state. There is excellent agreement between our analytical results and both experimental data and the results of numerical calculation.

Yan-Hong Qin, Yong Wu, Li-Chen Zhao +1 more

Wave properties of solitons in a two-component Bose–Einstein condensate are investigated in detail. We demonstrate that dark solitons in one of components admit interference and tunneling behavior, in sharp contrast to the scalar dark solitons and vector dark solitons. Analytic analyses of interference properties show that spatial interference patterns are determined by the relative velocity of solitons, while temporal interference patterns depend on the velocities and widths of two solitons, differing from the interference properties of scalar bright solitons. Especially, for an attractive interactions system, we show that interference effects between the two dark solitons can induce some short-time density humps (whose densities are higher than background density). Moreover, the maximum hump value is remarkably sensitive to the variation of the solitons’ parameters. For a repulsive interactions system, the temporal-spatial interference periods of dark–bright solitons have lower limits. Numerical simulation results suggest that interference patterns for the dark–bright solitons are more robust against noises than bright–dark solitons. These explicit interference properties can be used to measure the velocities and widths of solitons. It is expected that these interference behaviors can be observed experimentally and can be used to design matter wave soliton interferometer in vector systems.