  Events of giant conductance and anomalies of the phase transmission time for
holes, are theoretically investigated within the multicomponent scattering
approach. Based on this model, new analytical expressions for unitarity
relations in the uncoupled hole transport are obtained and directly applied to
study the behavior of the conductance and the phase transmission time in a
double barrier resonant tunneling (DBRT) and a superlattice $GaAs$-cladding
layer$/(AlAs/GaAs)^{n}/GaAs$-cladding layer. Clear-signature evidences of giant
conductance phenomena for hole transmission without valence-band mixing through
a DBRT and a superlattice were found. The giant conductance effect losses
robustness by manipulating the number of superlattice layers and by including
the valence-band particles coupling as well. Phase time through the
heterostructure exhibits extremal dependencies in the gaps and in the barriers,
as those reported before for electrons. We have detected an earlier arrival
phase time for the propagation of both flavors of holes within the barrier, in
the order of few tenths of picoseconds. An appealing filter-like effect is
presented, whenever a selective confinement strength arises independently for
both flavors of holes in the uncoupled regime. Our results also prescribe
noticeable evidences for both uncoupled and coupled hole fluxes, similar to
those foretold by Hartman, upon transmission of electrons through opaque
barriers.
