Dynamics of the Mott Transition in CuCl with Subpicosecond Time Resolution
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It is well known that a strongly excited semiconductor crystal may become partly metallic, due to the formation in the medium of a dense plasma of free electron-hole pairs. This plasma phase represents the lowest electronically excited state of the crystal, as long as the free carriers density n exceeds a critical value nc. If n falls below nc, the excited system reverts to an insulating (excitonic) phase consisting of strongly correlated electron-hole pairs. The complete understanding of this Mott-like transition, particularly its dynamical aspect, is of great interest, both from a fundamental point of view as well as for potential applications, e.g. in fast switching devices.
KeywordsMott Transition Solid State Comm Free Carrier Density Ecole Poly Plasma Appearance
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- 1.J. Etchepare, G. Grillon, R. Astier, J.L. Martin, C. Bruneau and A. Antonetti. Picosecond Phenomena III, Springer-Verlag (Berlin,Heidelberg,New York), 217, (1982).Google Scholar
- 2.For a recent review of biexciton luminescence in CuCl, see for instance J.B. Grun, B. Hönerlage, R. Levy in Excitons, E.I. Rashba and M.D.Sturge, editors North Holland (1982).Google Scholar