1.
Phys Rev Lett
; 93(16): 165901, 2004 Oct 15.
Article
in English
| MEDLINE
| ID: mdl-15525005
ABSTRACT
We report on the theoretical and experimental discovery of pairing of identical crystal steps. We first show that step bunching always occurs at long wavelength in the vicinity of an instability threshold when step dynamics is local. But an instability towards a stable train of pairs can be obtained when steps dynamics is nonlocal. This instability is shown to occur for transparent steps under electromigration. Observations on Si(111) under electromigration around 1230 degrees C show stable trains of pairs. By controlling both supersaturation and electromigration, we establish an experimental morphology diagram, from which we conclude that the transparency kinetic coefficient is negative.
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3.
Phys Rev B Condens Matter
; 48(20): 15453-15456, 1993 Nov 15.
Article
in English
| MEDLINE
| ID: mdl-10008088