  A chiral quasi-particle wave packet (c-QPWP) is defined as a conventional
superposition of chiral quasi-particle states corresponding to an interacting
electron system in two dimensions (2D) in the presence of Rashba spin-orbit
coupling (RSOC). I investigate its internal structure via studying the charge
and the current densities within the first order perturbation in the
electron-electron interaction. It is found that the c-QPWP contains a localized
charge which is less than the magnitude of the bare charge and the remaining
charge resides at the system boundary. The amount of charge delocalized turns
out to be inversely proportional to the degenerate Fermi velocity $v_0 ( =
\sqrt{\alpha^2 + 2\mu / m})$ when RSOC (with strength $\alpha$) is weak, and
therefore externally tunable. For strong RSOC, the magnitudes of both the
delocalized charge and the current further strongly depend on the direction of
propagation of the wave packet. Both the charge and the current densities
consist of an anisotropic $r^{-2}$ tail away from the centre of the wave
packet. Possible implications of such delocalizations in real systems
corresponding to 2D semiconductor heterostructure are also discussed within the
context of particle injection experiments.
