  Electron excitation in dielectrics is studied for an elliptically polarized
laser field. As the first step, we develop an analytical formula for electron
excitation rate under elliptically polarized laser as the extension of our
previous work [T.Otobe et. al., JPSJ88(2019) 024709]. In the next step, we
calculate the excitation rate depending on the band structure by assuming
direction dependence of reduced mass. We find that although the ellipticity
decreases the excitation rate significantly in an isotropic system, the energy
oscillation of electrons due to the intra-band dynamics in the anisotropic band
structure increases the excitation rate with higher ellipticity. Our results
indicate that we can control the excitation rate in dielectrics by varying the
ellipticity, depending on the band anisotropy.
