2D Excitonic Insulators

2D Excitonic Insulators (2)

Excitonic insulators are novel material systems that exhibit correlated electronic phases. When the exciton binding energy (Eb) is greater than the band gap (Eg), the excitons condense to their ground state. Exciton condensation in semiconductors occurs via the Bose-Einstein condensation process, whereas condensation in semimetals occurs via the Bardeen-Cooper-Schrieffer (BCS) process. Spontaneous band hybridization induced by Coulomb attraction between orthogonal conduction (electron) and valence (hole) bands opens the band gap and drives the system into an insulating state.

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