Seminarium Fizyki Ciała Stałego

Boron Nitride powder, white graphite has long been an important material for an eclectic range of industrial applications some of them linked to its layered structure, its good thermal conductivity, its high melting temperature, or the huge cross section for neutron absorption of its 10B isotope, or even in the industry of cosmetics, there in straightforward relation with its exceptional brightness. Solid state physicists were not really interested about it except some theorists among which were researchers of the group of Franco Bassani at Pisa. Wolfgang Choyke had carefully measured resonances of the dielectric constant above 6 eV, but he never published his experimental results. They were, but later, used by C. Doni and G. Pastori Paravicini for consolidating their calculation of the band structure made within the context of a tight binding description(Il Nuovo Cimento B, 64, 117, 1969).BN was exhumated from its “lethargy” in 2004 when T. Taniguchi grew high structural quality bulk BN flakes with micrometric dimensions, on which K. Watanabe demonstrated lasing operation at 215 nm ( Nat. Mat., 3,404, 2004), which boosted the interest of BN into the arena of devices for ultraviolet emission.The birth of Van der Waals structure has simultaneously offered to BN a large range of complementary applications as a passive, capping material.During this seminar I will review the linear and nonlinear optical properties of the different polytypes of sp²-bonded layered BN bulk crystals and epilayers (all having indirect fundamental bandgap). I will discuss the nature and the value of the bandgap of the monolayer and I will conclude with some of the last results concerning their applications for sources of single photon emission.UwagaSeminarium w trybie HybrydowymFaculty of Physics room 0.06patrz instrukcja :instrukcja: (pdf file)AttentionThe seminar in the REMOTE modesee instruction :instruction: (pdf file)