  We discuss heavy-quark dynamics in the quark-gluon plasma under a strong
magnetic field induced by colliding nuclei. By the use of the diagrammatic
resummation techniques for Hard Thermal Loop and the external magnetic field,
we show analytic results of heavy-quark diffusion coefficient and drag force
which become anisotropic due to the preferred spatial orientation in the
magnetic field. We argue that the anisotropic diffusion coefficient gives rise
to an enhancement/suppression of the heavy-quark elliptic flow depending on the
transverse momentum.
