Category Archives: material science

Direct and indirect excitons in boron nitride polymorphs: a story of atomic configurations and electronic correlation

In this work we study how different atomic configurations, and electronic correlation modify the exciton dispersion in hexagonal boron nitride. We use two different approaches, ab-initio DFT plus many-body perturbation theory and tight-binding. We found that in the case of AB-stacking electronic correlation inverts the nature of the optical gap, from indirect to direct respect… Read More

Stuff Matters

When my friend Lorenzo suggested me this book I was a bit sceptic. I thought that a book on material science could be boring. It is not astrophysics, there are not black holes, stars or galaxies. But Mark Miodownik is able to make material science interesting and absorbing. The book starts with a picture of… Read More