Measurement of cube‐root broadening of charge packets in metal‐oxide‐ semiconductor structures
1.K. K. Thornber, D. F. Nelson, and J. A. Cooper, Jr., Appl. Phys. Lett. 39, 843 (1981).
2.D. F. Nelson, J. Appl. Phys. 53, 5013 (1982).
3.D. F. Nelson, Phys. Rev. B 25, 5267 (1982).
4.The flux peak is displaced from the density peak by as seen from (5.10) of Ref. 2 provided and where is the transit time. [For the conditions of this experiment the time average of is about 0.01 and the time average of is about 0.07.] The traveling coordinate of any point in the flux pulse relative to the flux peak can be taken approximately as the drift velocity v multiplied by the measured time of arrival relative to the flux peak arrival. Hence (5) follows.
5.The effect that asymmetrization has on the quadratic term can be estimated by replacing ξ by where n is the packet density and‐αnt represents the velocity change due to the packet self‐produced [see (3.6) and (3.8) of Ref. 2 for a definition of α], resolving for the density as a function of ξ before forming the flux, and then obtaining a modification of (6). The quadratic coefficient is found to be reduced by a term which in ratio to the dominant term is This term has a value at most in our experiments of 4% of the dominant term.
6.J. A. Cooper, Jr. and D. F. Nelson, J. Appl. Phys. 54, 1445 (1983).
7.D. F. Nelson, J. A. Cooper, Jr., and A. R. Tretola, Appl. Phys. Lett. 41, 857 (1982).
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