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KdotPVelMethod

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Section Linear Response::KdotP
Type integer
Default grad_vel

Method of velocity calculation.

Options:

grad_vel:
$-i \left(\nabla + \left[r, V_{\rm nl} \right] \right)$
hcom_vel:
As a commutator of the position operator and Hamiltonian, $-i \left[ r, H \right]$.

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