The drag coefficient in the dilute-hole limit of the hard-core two-component Bose-Hubbard model on the square lattice is exactly 1-2/π, about 0.36, and the effect is carried by hole-spin polarons.
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Vacancy-assisted superfluid drag
The drag coefficient in the dilute-hole limit of the hard-core two-component Bose-Hubbard model on the square lattice is exactly 1-2/π, about 0.36, and the effect is carried by hole-spin polarons.