| Issue |
EPL
Volume 98, Number 3, May 2012
|
|
|---|---|---|
| Article Number | 37004 | |
| Number of page(s) | 6 | |
| Section | Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties | |
| DOI | https://doi.org/10.1209/0295-5075/98/37004 | |
| Published online | 11 May 2012 | |
Strong excitons in novel two-dimensional crystals: Silicane and germanane
1
Dipartimento di Fisica, Università di Roma Tor Vergata - Via della Ricerca Scientifica 1, I-00133 Rome, Italy, EU
2
CNR-ISM - Via Fosso del Cavaliere 100, I-00133 Rome, Italy, EU
3
IFTO, Friedrich Schiller Universität - Max-Wien Platz 1, D-07742 Jena, Germany, EU
4
European Theoretical Spectroscopy Facility
Received:
5
February
2012
Accepted:
10
April
2012
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.
PACS: 71.35.Cc – Intrinsic properties of excitons; optical absorption spectra / 73.22.-f – Electronic structure of nanoscale materials and related systems / 78.67.Wj – Optical properties of graphene
© EPLA, 2012
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