Ground state and elicitations of a spin chain with orbital degeneracy

被引：55

作者：

Li, YQ ^{[1
]}

Ma, M

Shi, DN

Zhang, FC

机构：

[1] Univ Cincinnati, Dept Phys, Cincinnati, OH 45221 USA

[2] Zhejiang Univ, Zhejiang Inst Modern Phys, Hangzhou 310027, Peoples R China

[3] Nanjing Univ Aeronaut & Astronaut, Coll Sci, Nanjing 210016, Peoples R China

来源：

PHYSICAL REVIEW B | 1999年 / 60卷 / 18期

关键词：

D O I：

10.1103/PhysRevB.60.12781

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The one-dimensional Heisenberg model in the presence of orbital degeneracy is studied at the SU(4) symmetric point by means of Bethe ansatz. Following Sutherland's previous work on an equivalent model, we discuss the ground state and the low-lying excitations more extensively in connection to the spin systems with orbital degeneracy. We show explicitly that the ground state is a SU(4) singlet. We study the degeneracies of the elementary excitations and the spectra of the generalized magnons consisting of these excitations. We also discuss the complex 2-strings in the context of the Bethe ansatz solutions. [S0163-1829(99)00238-6].

引用

页码：12781 / 12787

页数：7

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