Browsing Geldart, Wally by Author "Gumbs, G."
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Convergence properties as a function of spatial dimensionality of gradient expansions for the ground-state energy of an inhomogeneous electron gas
Geldart, D. J. W., and G. Gumbs. 1986. "Convergence properties as a function of spatial dimensionality of gradient expansions for the ground-state energy of an inhomogeneous electron gas." Physical Review B (Condensed Matter) 33(4): 2820-3. Copyright © 1986 American Physical Society.The extended Thomas-Fermi approximation for the ground-state energy of a many-fermion system is generalized to arbitrary spatial dimension. The authors' objective is a better understanding of convergence properties of such ... -
Depth-dependent static shielding of an impurity by a quantum plasma in a magnetic field
Gumbs, G., and D. J. W. Geldart. 1984. "Depth-dependent static shielding of an impurity by a quantum plasma in a magnetic field." Physical Review B (Condensed Matter) 29(10): 5445-57. Copyright © 1984 American Physical Society.The static shielding of a charged impurity embedded in a quantum plasma is studied with the use of linear-response theory. The required response function is calculated in the random-phase approximation with a uniform ... -
Linear-response function of a semi-infinite degenerate plasma in the presence of an external magnetic field
Glasser, M. L., D. J. W. Geldart, and G. Gumbs. 1984. "Linear-response function of a semi-infinite degenerate plasma in the presence of an external magnetic field." Physical Review B (Condensed Matter) 29(12): 6468-73. Copyright © 1984 American Physical Society.The static linear-response function x0(r,r') of a semi-infinite, degenerate plasma of noninteracting electrons is calculated in the presence of an external magnetic field perpendicular to the surface. The surface is simulated ... -
Nonlocal exchange energy of many-fermion systems of arbitrary dimensionality and interparticle interaction
Gumbs, G., and D. J. W. Geldart. 1986. "Nonlocal exchange energy of many-fermion systems of arbitrary dimensionality and interparticle interaction." Physical Review B (Condensed Matter) 34(10): 6847-52. Copyright © 1986 American Physical Society.The exchange contributions to the ground-state energy of an inhomogeneous many-fermion system of arbitrary dimensionality are calculated. Explicit results are given for both the local-density approximation and the lowest-order ... -
Surface-induced quantum density oscillations in the presence of an external magnetic field
Geldart, D. J. W., G. Gumbs, and M. L. Glasser. 1985. "Surface-induced quantum density oscillations in the presence of an external magnetic field." Physical Review B (Condensed Matter) 31(6): 3315-22. Copyright © 1985 American Physical Society.The electron number density and spin density near the surface of a model metal, semimetal, or semiconductor are calculated in the presence of a uniform magnetic field. The magnetic field is applied in a direction perpendicular ...