@article{oai:kanazawa-u.repo.nii.ac.jp:00011077,
 author = {Tang, Zheng Ming and Nagai, Yasuyoshi and Inoue, Ken and Toyama, Takeshi and Chiba, Toshinobu and Saito, Mineo and Hasegawa, Masayuki},
 issue = {10},
 journal = {Physical Review Letters},
 month = {Mar},
 note = {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. © 2005 The American Physical Society., 金沢大学理工研究域数物科学系},
 title = {Self-energy correction to momentum-density distribution of positron-electron pairs},
 volume = {94},
 year = {2005}
}