FERMION-SPIN TRANSFORMATION TO IMPLEMENT THE CHARGE-SPIN SEPARATION

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	FERMION-SPIN TRANSFORMATION TO IMPLEMENT THE CHARGE-SPIN SEPARATION
	FENG, SP , INT CTR THEORET PHYS, POB 586, I-34100 TRIESTE, ITALY.; FENG, SP; SU, ZB; YU, L
刊名	PHYSICAL REVIEW B
	1994
卷号	49 期号:4 页码:2368-2384
关键词	T-j-model Resonating-valence-bond Antiferromagnetic Heisenberg-model Dimensional Hubbard-model Mean-field-theory Correlated Electronic Systems Quantum Antiferromagnet Luttinger-liquid Single Hole Spectral-function
ISSN号	1098-0121
英文摘要	A fermion-spin transformation is used to implement the charge-spin separation, and is developed to study the low-dimensional t-J model. In this approach, the charge and spin degrees of freedom of the physical electron are separated, and the charge degree of freedom is represented by a spinless fermion while the spin degree of freedom is represented by a hard-core boson. The on-site local constraint for single occupancy is satisfied even in the mean-held approximation and the sum rule for the physical electron is obeyed. This approach can be applied to both one and two-dimensional systems. In the one-dimensional case, the spinon as well as the physical electron behave like Luttinger liquids. We have obtained a gapless charge and spin excitation spectrum, a good ground state energy, and a reasonable electron-momentum distribution within the mean-field approximation. The correct exponents of the correlation functions and momentum distribution are also obtained if the squeezing effect and rearrangement of the spin configurations are taken into account. In the two-dimensional case, within the mean-held approximation the magnetized flux state with a gap in the spinon spectrum has the lowest energy at half-filling. The antiferromagnetic long-range order is destroyed by hole doping of the order similar to 10 - 15 % for t/J = 3 - 5 and a disordered flux state with gapless spinon spectrum becomes stable. The calculated specific heat is roughly consistent with observed results on copper oxide superconductors. The possible phase separation is also discussed at the mean-field level.
学科主题	Physics
URL标识	查看原文
WOS记录号	WOS:A1994MV08900011
公开日期	2012-08-29
内容类型	期刊论文
源URL	[http://ir.itp.ac.cn/handle/311006/11960]
专题	理论物理研究所_理论物理所1978-2010年知识产出
通讯作者	FENG, SP , INT CTR THEORET PHYS, POB 586, I-34100 TRIESTE, ITALY.
推荐引用方式 GB/T 7714	FENG, SP , INT CTR THEORET PHYS, POB 586, I-34100 TRIESTE, ITALY.,FENG, SP,SU, ZB,et al. FERMION-SPIN TRANSFORMATION TO IMPLEMENT THE CHARGE-SPIN SEPARATION[J]. PHYSICAL REVIEW B,1994,49(4):2368-2384.
APA	FENG, SP , INT CTR THEORET PHYS, POB 586, I-34100 TRIESTE, ITALY.,FENG, SP,SU, ZB,&YU, L.(1994).FERMION-SPIN TRANSFORMATION TO IMPLEMENT THE CHARGE-SPIN SEPARATION.PHYSICAL REVIEW B,49(4),2368-2384.
MLA	FENG, SP , INT CTR THEORET PHYS, POB 586, I-34100 TRIESTE, ITALY.,et al."FERMION-SPIN TRANSFORMATION TO IMPLEMENT THE CHARGE-SPIN SEPARATION".PHYSICAL REVIEW B 49.4(1994):2368-2384.