ESTIMATE OF HUBBARD-U FOR C-60 BY USE OF OPTICAL-ABSORPTION

被引：27

作者：

FRIEDMAN, B ^{[1
]}

KIM, JW ^{[1
]}

机构：

[1] UNIV HOUSTON,DEPT PHYS,HOUSTON,TX 77204

来源：

PHYSICAL REVIEW B | 1992年 / 46卷 / 13期

关键词：

D O I：

10.1103/PhysRevB.46.8638

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We consider the optical absorption of C60 within a simple tight-binding model. To obtain a reasonable agreement with experiment a sizable Hubbard U must be included. We estimate U to be in the range from one-half to the full "bandwidth" where the bandwidth is roughly 13 eV. In our picture the two lowest-energy large-absorption peaks are due to single-particle transitions: H(u) goes to T(lg), and H(g) goes to T(lu), respectively. The weak absorption from 3.0 to 1.9 eV is attributed to the dipole-forbidden transition: H(u) goes to T(lu) "split" by electron-electron repulsion.

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页码：8638 / 8641

页数：4

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