On compression of alpha-cristobalite SiO2 to pressures above approximately 12 GPa, a new polymorph known as cristobalite X-I forms. The existence of cristobalite X-I has been known for several decades ...

Understanding disordered structure is difficult due to insufficient information in experimental data. Here, we overcome this issue by using a combination of diffraction and simulation to investigate ...

Impact Statement: In this work, a novel GaN-based VCSEL with tapered SiO 2-buried structure is proposed. Compared to conventional flat aperture VCSELs, tapered aperture VCSELs show the lower threshold ...