Power-law conductivity inside the Mott gap:: Application to κ-(BEDT-TTF)2Cu2(CN)3

被引：50
|
作者：
Ng, Tai-Kai
Lee, Patrick A.
机构：
[1] Hong Kong Univ Sci & Technol, Dept Phys, Hong Kong, Hong Kong, Peoples R China
[2] MIT, Dept Phys, Cambridge, MA 02139 USA
来源：
PHYSICAL REVIEW LETTERS | 2007年 / 99卷 / 15期
关键词：
D O I：
10.1103/PhysRevLett.99.156402
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
The charge dynamics of spin-liquid states described by U(1) gauge theory coupling to fermionic spinons is discussed in this paper. We find that the gapless spinons give rise to a power-law optical conductivity inside the charge gap. The theory is applied to explain the unusual optical conductivity observed recently in the organic compound kappa-(BEDT-TTF)(2)Cu-2(CN)(3). We also propose an optical experiment to search for the in-gap excitations in the kagome spin-liquid insulator.
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页数：4
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