  We treat the tensor correlation in antisymmetrized molecular dynamics (AMD)
including large-relative-momentum components among nucleon pairs for finite
nuclei. The tensor correlation is described by using large imaginary centroid
vectors of Gaussian wave packets for nucleon pairs with opposite directions,
which makes a large relative momentum. We superpose the AMD basis states, in
which one nucleon pair has various relative momenta for all directions; this
new method is called "high-momentum AMD" (HM-AMD). We show the results for
$^4$He using the effective interaction having a strong tensor force. It is
found that HM-AMD provides a large tensor matrix element comparable to the case
of the tensor-optimized shell model (TOSM), in which the two-particle-two-hole
(2p-2h) excitations are fully included to describe the tensor correlation. The
results of two methods agree with each other at the level of the Hamiltonian
components of $^4$He. This indicates that in HM-AMD the high-momentum
components described by the imaginary centroid vectors of the nucleon pair
provide the equivalent effect of the 2p-2h excitations for the tensor
correlation.
