Light emission from Er at the As-terminated Si(111) surface

Evans, P. G.; Evans, P.G.; Golovchenko, J. A.; Golovchenko, J.A.
October 2000
Applied Physics Letters;10/2/2000, Vol. 77 Issue 14
Academic Journal
Erbium atoms at an arsenic-terminated Si(111) surface can be made to emit light at the 1.55 μm wavelength associated with an internal transition in the Er[sup 3+] ion. The As-terminated surface prepared under ultrahigh vacuum conditions has a surface recombination velocity of 50 cm s-1 and partially suppresses competing nonradiative recombination mechanisms. Following the deposition of Er, its characteristic light emission is observed only after oxygen reacts with the surface. The intensity of the light emitted by Er increases significantly upon cooling from 310 to 215 K. No light emission was observed from Er atoms deposited on 7x7 or H-terminated surfaces. © 2000 American Institute of Physics.


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