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Letter

Nature Physics 3, 632–635 (1 September 2007) | doi:10.1038/nphys674

All-optical injection of ballistic electrical currents in unbiased silicon

Louis Costa , Markus Betz , Marko Spasenovi|[cacute]| , Alan D. Bristow & Henry M. van Driel

Silicon has been the dominant material in electronics since the invention of the integrated transistor. In contrast, silicon|[rsquo]|s indirect bandgap and vanishing second-order optical nonlinearity limit its applications in optoelectronics.