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Hund's coupling driven photocarrier relaxation in the two-band Mott insulator
Physical review B
We study the relaxation dynamics of photo-carriers in the paramagnetic Mott insulating phase of the half-filled two-band Hubbard model. Using nonequilibrium dynamical mean field theory, we excite charge carriers across the Mott gap by a short hopping modulation, and simulate the evolution of the photo-doped population within the Hubbard bands. We observe an ultrafast charge-carrier relaxation driven by emission of local spin excitations with an inverse relaxation time proportional to the Hund'sdoi:10.1103/physrevb.96.165104 fatcat:wwkpcqi2jfb55chgz2q6n4cw44