One- and two-photon spectroscopy in hexagonal boron nitride

Guillaume Cassabois (1)

1 L2C - Laboratoire Charles Coulomb

I will discuss our recent experiments by one- and two-photon spectroscopy demonstrating that hBN is an indirect bandgap material. I will show that the optical properties of hBN are profoundly determined by phonon-assisted transitions involving either virtual or real excitonic states. I will present our measurements of the exciton binding energy by two-photon excitation, leading to the estimation of 6.08 eV for the single-particle bandgap in hBN.

Domaines: Autre [cond-mat.other]

Guillaume Cassabois. One- and two-photon spectroscopy in hexagonal boron nitride. PLMCN17, Mar 2016, Nara, Japan. ⟨hal-01358449⟩