TY - JOUR
T1 - Self-energy correction to momentum-density distribution of positron-electron pairs
AU - Tang, Z.
AU - Nagai, Y.
AU - Inoue, K.
AU - Toyama, T.
AU - Chiba, T.
AU - Saito, M.
AU - Hasegawa, M.
PY - 2005/3/18
Y1 - 2005/3/18
N2 - Positron two-dimensional angular correlation of annihilation radiation (2D ACAR), i.e., the 2D projection of the electron momentum densities sampled by positron, in Si is employed to verify the prediction of the density functional theory within the local-density approximation (LDA). Carefully conducted test shows that the LDA introduces small but definite discrepancies to the 2D-ACAR anisotropies. Self-energy calculation using the GW method indicates that density-fluctuation contributes anisotropic momentum-density correction and thus improves the agreement between theory and experiment. These results provide valuable annotations to the arguments concerning the accuracy and validity of the LDA and GW schemes.
AB - Positron two-dimensional angular correlation of annihilation radiation (2D ACAR), i.e., the 2D projection of the electron momentum densities sampled by positron, in Si is employed to verify the prediction of the density functional theory within the local-density approximation (LDA). Carefully conducted test shows that the LDA introduces small but definite discrepancies to the 2D-ACAR anisotropies. Self-energy calculation using the GW method indicates that density-fluctuation contributes anisotropic momentum-density correction and thus improves the agreement between theory and experiment. These results provide valuable annotations to the arguments concerning the accuracy and validity of the LDA and GW schemes.
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U2 - 10.1103/PhysRevLett.94.106402
DO - 10.1103/PhysRevLett.94.106402
M3 - Article
AN - SCOPUS:18044391287
VL - 94
JO - Physical Review Letters
JF - Physical Review Letters
SN - 0031-9007
IS - 10
M1 - 106402
ER -