Interband absorption in single layer hexagonal boron nitride
  Monolayer of hexagonal boron nitride (h-BN), commonly known as "white graphene" is a promising wide bandgap semiconducting material for deep-ultaviolet optoelectronic devices. In this report, the light absorption of a single layer hexagonal boron nitride is calculated using a tight-binding Hamiltonian. The absorption is found to be monotonically decreasing function of photon energy compared to graphene where absorption coefficient is independent of photon energy and characterized by the effective fine-structure constant. 
Aniruddha Konar, Raj Jana, Tian Fang, Guowang Li, William O'Brien, and   Debdeep Jena
cond-mat.mes-hall cond-mat.mtrl-sci