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We studied dipole excitations in $^{10}$Be based on an extended version ofthe antisymmetrized molecular dynamics, which can describe 1p-1h excitationsand large amplitude cluster modes. Toroidal and compressive dipole operatorsare found to be good proves to separate the low-energy and high-energy parts ofthe isoscalar dipole excitations, respectively. Two low-energy $1^-$ states,the toroidal dominant $1^-_1$ state at $E\sim 8$ MeV and the $E1$ dominant$1^-_2$ state at $E\sim 16$ MeV, were obtained. By analysis of transitioncurrent densities, the $1^-_1$ states is understood as a toroidal dipole modewith exotic toroidal neutron flow caused by rotation of a deformed$^6\textrm{He}$ cluster, whereas the $1^-_2$ state is regarded as aneutron-skin oscillation mode, which are characterized by surface neutron flowwith inner isoscalar flow caused by the surface neutron oscillation against the$2\alpha$ core.

Toroidal, compressive, and $E1$ properties of low-energy dipole modes in $^{10}$Be