Abstract

In a Mott insulator, excess charge carriers in narrow half-filled degenerate bands form spin polarons. An electron-hole pair forms an exciton embedded in a ferromagnetic volume, the radius of which is large compared to the exciton Bohr radius. If a wide conduction band lies in the Hubbard gap, the exciton radius can be large compared to the hole-polaron radius. Then, depending on the exciton concentration, a gas of excitonic molecules of an electron-hole plasma can be formed.

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