Vortrag

Datum:		19.3.2007
Uhrzeit:		14:00 Uhr
Ort:		PTB, Berlin, Hermann-von-Helmholtz-Bau
Titel:		Isotopically Enriched Si: Redefining the limits of Spectroscopy in Semiconductors
Vortragender:		Prof. M. Thewalt Department of Physics, Simon Fraser University, Burnaby, Canada

Abstract:		The discovery (Phys. Rev. Lett. 86, 6010 (2001)) that the linewidths of shallow bound exciton transitions in highly enriched 28Si were far narrower than the best linewidths ever observed in natural Si opened the door to many new discoveries in semiconductor spectroscopy. The talk will review these developments, culminating in the discovery of the donor hyperfine splitting in the 31P bound exciton transition, which allows the optical detection and ionization of neutral donors in specific electronic and nuclear spin states (Phys. Rev. Lett. 97, 227401 (2006)). This may have applications in quantum computing and information processing, and in the observation of NMR from single atoms. More recent unpublished results will also be outlined showing that the huge improvements in the spectroscopy of shallow levels, resulting from the near-elimination of the inhomogeneous isotope broadening in natural Si, can be extended to deeper defects as well.
Veranstalter:		Abteilung PTB