Single-hole dynamics in dimerized and frustrated spin chains

被引：14
|
作者：
Jurecka, C [1 ]
Brenig, W [1 ]
机构：
[1] Tech Univ Carolo Wilhelmina Braunschweig, Inst Theoret Phys, D-38106 Braunschweig, Germany
来源：
PHYSICAL REVIEW B | 2001年 / 63卷 / 09期
关键词：
D O I：
10.1103/PhysRevB.63.094409
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We present a unified account fur the coupled single-hole and spin dynamics in the spin-gap phase of dimerized and frustrated spin chains and two-legs spin ladders. Based on the strong dimer limit of a one-dimensional t(1,2,3)-J(1,2,3) model a diagrammatic approach is presented that employs a mapping of the spin Hamiltonian onto a pseudofermion bond-boson model. Results for the single-hole spectrum are detailed. A finite quasiparticle weight is observed and studied for a variety of system parameters. A comparison with existing exact-diagonalization data is performed and good agreement is found.
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页数：11
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