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R. W. Zwanzig, in Quantum Statistical Mechanics, edited by Paul H. E. Meijer (Gordon and Breach, New York, 1966), p. 139.
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(private communication)
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0000310417
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Also discussed in this reference are the physical effects ignored when invoking the random-phase approximation, which is necessary to truncate the BBGKY hierarchy and obtain a closed equation for the one-particle density matrix
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The appearance of the two-particle density matrix in the equation of motion for the one-particle density matrix is a reflection of the well-known Bogoliubov-Born-Green-Kirkwood-Yvon (BBGKY) hierarchy, discussed by U. Hohenester and W. Pötz, Phys. Rev. B 56, 13 177 (1997).Also discussed in this reference are the physical effects ignored when invoking the random-phase approximation, which is necessary to truncate the BBGKY hierarchy and obtain a closed equation for the one-particle density matrix.
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40
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17544371067
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for a case in which these contributions matter
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Inserting Eq. (40) into Eq. (39), the second terms on the right-hand side of Eq. (40) cancel under the sum over (Formula presented) in the “diagonal” (Formula presented) case. However, in the general case of an inhomogeneous system considered here, such a cancellation does not occur for (Formula presented) so that these terms give additional contributions to the equation of motion for the off-diagonal elements of the reduced density matrix. See, for example, O. Hess and T. Kuhn, Phys. Rev. A 54, 3347 (1996), for a case in which these contributions matter.
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University of Michigan report (unpublished)
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R. K. Mains and G. I. Haddad, University of Michigan report (unpublished);results reported in Ref. 15.
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85038966879
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Clearly, the case of valence bands degenerate at the expansion point (Formula presented) requires alternative approaches retaining interband effects, such as those by G. Bastard, Wave Mechanics Applied to Semiconductor Microstructures (Halsted Press, New York, 1989);
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Clearly, the case of valence bands degenerate at the expansion point (Formula presented) requires alternative approaches retaining interband effects, such as those by G. Bastard, Wave Mechanics Applied to Semiconductor Microstructures (Halsted Press, New York, 1989);
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54
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85038911058
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W. R. Frensley, “Current density operator in systems with nonparabolic, position dependent energy bands,” at the URL: http://www.utdallas.edu/dept/ee/frensley/technical/currden/currden.html
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W. R. Frensley, “Current density operator in systems with nonparabolic, position dependent energy bands,” at the URL: http://www.utdallas.edu/dept/ee/frensley/technical/currden/currden.html
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56
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85038902826
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The statement “extrapolated from the closest band” must be intended in the following sense: Two complex dispersions, (Formula presented) and (Formula presented) are computed using the coefficients (Formula presented) for the two bands m and (Formula presented) between which tunneling is considered. For a given energy E, the two values (Formula presented) and (Formula presented) at the given energy are computed and the dispersion corresponding to the smallest value for (Formula presented) is chosen
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The statement “extrapolated from the closest band” must be intended in the following sense: Two complex dispersions, (Formula presented) and (Formula presented) are computed using the coefficients (Formula presented) for the two bands m and (Formula presented) between which tunneling is considered. For a given energy E, the two values (Formula presented) and (Formula presented) at the given energy are computed and the dispersion corresponding to the smallest value for (Formula presented) is chosen.
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59
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85038900373
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IEEE Transaction on Semiconductor Technology Modeling and Simulation (http://www.ieee.org/journal/tcad) at URL http://engine.ieee.org/tcad/journal/accepted/ fischetti-feb9
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M. V. Fischetti, N. Sano, S. E. Laux, and K. Natori, IEEE Transaction on Semiconductor Technology Modeling and Simulation (http://www.ieee.org/journal/tcad) at URL http://engine.ieee.org/tcad/journal/accepted/ fischetti-feb97
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Fischetti, M.V.1
Sano, N.2
Laux, S.E.3
Natori, K.4
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