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Electric dipole ($E1$) response of $^{6}$He is studied with a fullymicroscopic six-body calculation. The wave functions for the ground and excitedstates are expressed as a superposition of explicitly correlated Gaussians(CG). Final state interactions of three-body decay channels are explicitlytaken into account. The ground state properties and the low-energy $E1$strength are obtained consistently with observations. Two main peaks as well asseveral small peaks are found in the $E1$ strength function. The peak at thehigh-energy region indicates a typical macroscopic picture of the giant dipoleresonance, the out-of-phase proton-neutron motion. The transition densities ofthe lower-lying peaks exhibit in-phase proton-neutron motion in the internalregion, out-of-phase motion near the surface region, and spatially extendedneutron oscillation, indicating a soft-dipole mode (SDM) and its vibrationallyexcited mode.

Electric dipole response of $^6$He: Halo-neutron and core excitations