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晶格量子涨落对spin-Peierls系统低能量激发态的影响
引用本文:徐靖,王治国,石云龙,陈宇光,陈鸿. 晶格量子涨落对spin-Peierls系统低能量激发态的影响[J]. 物理学报, 2004, 53(11): 3882-3887
作者姓名:徐靖  王治国  石云龙  陈宇光  陈鸿
作者单位:(1)同济大学物理系,上海 200092; (2)雁北师范学院物理系,大同 037000; (3)雁北师范学院物理系,大同 037000;同济大学物理系,上海 200092;中国科学院上海技术物理研究所红外物理国家重点实验室,上海 200083
基金项目:国家自然科学基金(批准号:90301022和10674065)及山西省青年科技研究基 金(批准号:20021006)资助的课题.
摘    要:
在非绝热近似下,研究了一维spin-Peierls系统中晶格量子涨落 对系统性质的影响,讨论了系统的二聚化相变、单粒子激发和双粒子束缚态. 结果表明,量子晶格涨落会抑制晶格的二聚化,破坏系统的spin-Peierls基态稳定性.在临界点,系统发生从二聚化spin-Peierls态向无能隙态的相变. 自旋声子耦合强度对束缚态能隙的影响比单粒子激发谱能隙显著. 关键词:sin-Peierls系统非绝热近似玻色化相图

关 键 词:sin-Peierls系统  非绝热近似  玻色化  相图
收稿时间:2004-02-02

Quantum lattice dynamical effects on the low-energy excitations in spin-Peierls systems
Xu Jing ))) Wang Zhi_Guo ) Shi Yun_Long ) Chen Yu_Guang ) Chen Hong ) ). Quantum lattice dynamical effects on the low-energy excitations in spin-Peierls systems[J]. Acta Physica Sinica, 2004, 53(11): 3882-3887
Authors:Xu Jing ))) Wang Zhi_Guo ) Shi Yun_Long ) Chen Yu_Guang ) Chen Hong ) )
Affiliation:Xu Jing 1)2)3) Wang Zhi_Guo 2) Shi Yun_Long 1) Chen Yu_Guang 2) Chen Hong 2) 1)
Abstract:
Using the bosonization technique and Gaussian wave functional method, we investi gate the low-energy excitations of a spin-Peierls chain where the spins interact with quantum phonons. The results show that the energy gap of the one- and two- particle excitation states decrease gradually when spin-phonon coupling constant decreases or the phonon frequency increases. A quantum phase transition from a gapless spin-fluid phase to a gapped dimerized phase occurs at a nonzero critica l value of the spin-phonon coupling. Our results indicate that the two-particle excitation spectrum is much more sensitive to spin-phonon coupling constant than the one-particle excitation spectrum.
Keywords:spin-Peierls system   nonadiabatic limit    bosonization   phase diagram
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