  Any homogeneous expanding Ricci soliton is known to be isometric to a Lie
subgroup of the solvable part of the Iwasawa decomposition associated with a
symmetric space of non-compact type, with the metric induced as a submanifold.
In this paper, we classify and analyze the geometry of such Lie subgroups with
Ricci soliton induced metric when the symmetric spaces are complex hyperbolic
spaces.
