  We theoretically consider a junction composed of a ferromagnetic insulator
(FI) and a two-dimensional electron gas (2DEG) with Rashba- and
Dresselhaus-type spin-orbit interactions. Using the Boltzmann equation, we
calculate an electric current in 2DEG induced by the inverse Edelstein when
imposing the temperature difference between FI and 2DEG. We clarify how the
induced current depends on the magnetization direction of FI, spin texture on
the Fermi surface of 2DEG, and temperature. Our result provides an important
foundation for an accurate analysis of the inverse Edelstein effect induced by
thermal spin injection.
