Correlation energy of 2-D electrons |
| |
Authors: | A Isihara T Toyoda |
| |
Institution: | Statistical Physics Laboratory Department of Physics, State University of New York at Buffalo, Buffalo, New York, 14260 USA |
| |
Abstract: | The correlation energy and the Fermi momentum of an electron gas in 2-D are evaluated explicitly as functions of density. The ring diagram and first- and second-order exchange contributions are treated. In comparison with the 3-D case, the kinetic energy for the same rs is approximately one-half and the exchange and correlation energies are somewhat larger. The ground state energy plotted against rs shows a minimum at around rs = 1.65 with a minimum value of ?0.9858 Ryd. If the third-order ring contribution is added, the curve is shifted upward. The correlation energy is ?0.6258 to order e4. The third-order ringw contribution increases this value almost linearly with rs. The Fermi momentum decreases with rs due to the contribution. Different from the 3-D case, no ln rs term appears in the correlation energy within the approximation. |
| |
Keywords: | |
本文献已被 ScienceDirect 等数据库收录! |
|