We show by first-principles calculations that, due to depressed screening and enhanced two-dimensional confinement, excitonic resonances with giant oscillator strength appear in hydrogenated Si and Ge layers, which qualitatively and quantitatively differ from those of graphane. Their large exciton binding energies and oscillator strengths make them promising for observation of novel physical effects and application in optoelectronic devices on the nanoscale.
Strong excitons in novel two-dimensional crystals: Silicane and germanane / Pulci O; Gori P; Marsili M; Garbuio V; Del Sole R; Bechstedt F. - In: EUROPHYSICS LETTERS. - ISSN 0295-5075. - STAMPA. - 98:(2012), pp. 37004-37010. [10.1209/0295-5075/98/37004]
Strong excitons in novel two-dimensional crystals: Silicane and germanane
Marsili M;
2012
Abstract
We show by first-principles calculations that, due to depressed screening and enhanced two-dimensional confinement, excitonic resonances with giant oscillator strength appear in hydrogenated Si and Ge layers, which qualitatively and quantitatively differ from those of graphane. Their large exciton binding energies and oscillator strengths make them promising for observation of novel physical effects and application in optoelectronic devices on the nanoscale.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
