2-PHASE COEXISTENCE AND SEMIMETALLIC STATES IN CONDUCTING POLYMERS

被引:12
作者
SALKOLA, MI [1 ]
KIVELSON, SA [1 ]
机构
[1] UNIV CALIF LOS ANGELES,DEPT PHYS,LOS ANGELES,CA 90024
来源
PHYSICAL REVIEW B | 1994年 / 50卷 / 19期
关键词
D O I
10.1103/PhysRevB.50.13962
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
We study a simple model of conducting polymers, such as polyacetylene, which consists of a quasi-one-dimensional coupled electron-phonon system with short-range electron-electron repulsions. The problem is solved in the Hartree-Fock approximation. A variety of experimentally measurable properties of the system, especially the infrared absorption spectrum, are computed. (i) As a function of doping, the interchain coupling causes the system to undergo a phase transition from a correlated soliton-lattice state to a metallic state, described by a weakly interacting but highly anisotropic three-dimensional Fermi liquid. The result is consistent with a previous renormalization-group treatment. (ii) When interactions with counterions are included, the nonmetal-metal transition is very sensitive to the arrangement of counterions relative to the polymer chain: a minor change in the arrangement will either stabilize or destabilize the soliton state allowing the coexistence of the metallic and the soliton states. (iii) For realistic three-dimensional band structures, a semimetallic phase intervenes the nonmetallic (Peierls) and metallic (Fermi-liquid) phases. © 1994 The American Physical Society.
引用
收藏
页码:13962 / 13973
页数:12
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