CRITICAL PROPERTIES OF THE QUANTUM SINE-GORDON EQUATION

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	CRITICAL PROPERTIES OF THE QUANTUM SINE-GORDON EQUATION
	G. M. Zhang; H. Chen; X. Wu
	1991
发表期刊	Physical Review B
ISSN	0163-1829
卷号	43 期号:16 页码:13566-13571
摘要	We have developed a quantum-mechanical approach to study the critical properties of the quantum sine-Gordon equation describing a massless scalar field in 1 + 1 space-time dimensions with interaction density proportional to cos(beta-0-phi). The main feature of the present theory is to find an appropriate starting point for perturbation expansion, which can directly treat the infrared divergences encountered in the conventional perturbation theory. Exact critical conditions for the phase transition of the model are derived; and the quantum sine-Gordon Hamiltonian is found to correspond exactly to a free-field model. Near the critical regime, a gap will open near zero momentum in the excitation spectrum, and the corresponding ground-state wave function is a pairing quasiparticle state, analogous to the BCS superconducting state. It is proved that this ground state will possess quasi-long-range and quasi-off-diagonal long-range correlations. Comparisons with the Kosterlitz-Thouless classical theory of the two-dimensional Coulomb gas are also made.
部门归属	acad sinica,int ctr mat phys,chinese ctr adv sci & technol,world lab,ctr theoret phys,shenyang,peoples r china.;zhang, gm (reprint author), tong ji univ,pohl inst solid state phys,shanghai 200092,peoples r china
关键词	2-dimensional Coulomb Gas Squeezed-state Approach Yang-mills Theory Superconducting Films Phase-transitions Quark Confinement Critical-behavior Thirring Models Gauge Theories Field-theory
URL	查看原文
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/39499
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	G. M. Zhang,H. Chen,X. Wu. CRITICAL PROPERTIES OF THE QUANTUM SINE-GORDON EQUATION[J]. Physical Review B,1991,43(16):13566-13571.
APA	G. M. Zhang,H. Chen,&X. Wu.(1991).CRITICAL PROPERTIES OF THE QUANTUM SINE-GORDON EQUATION.Physical Review B,43(16),13566-13571.
MLA	G. M. Zhang,et al."CRITICAL PROPERTIES OF THE QUANTUM SINE-GORDON EQUATION".Physical Review B 43.16(1991):13566-13571.