Graphite-diamond phase transition induced by interlayer charge transfer exciton in visible region

摘要: A new photoinduced phase with interlayer σ bonds was experimentally discovered in a graphite crystal. We theoretically study the mechanism of this nonequilibrium transition, terms proliferation photogenerated charge transfer (CT) excitations visible region. At Franck–Condon state, resultant electron–hole pair is quite unstable, being easily dissipated into two-dimensional (2D) electronic continuum as plus and minus free carriers. However, by small probability, electron hole are bound an CT exciton, due to Coulomb attraction between them. This exciton self-localizes, contracting distance buckling six membered ring graphite, only around it. Due plenty excitations, cooperatively formed, thus tiny sp3 nanoscale domain appears.