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题名: FERMION-SPIN TRANSFORMATION TO IMPLEMENT THE CHARGE-SPIN SEPARATION
作者: FENG, SP ;  SU, ZB ;  YU, L
刊名: PHYSICAL REVIEW B
出版日期: 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
学科分类: Physics
通讯作者: FENG, SP , INT CTR THEORET PHYS, POB 586, I-34100 TRIESTE, ITALY.
部门归属: BEIJING NORMAL UNIV, DEPT PHYS, BEIJING 100875, PEOPLES R CHINA; CHINESE ACAD SCI, INST THEORET PHYS, BEIJING 100080, PEOPLES R CHINA
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.
收录类别: SCI
原文出处: 查看原文
WOS记录号: WOS:A1994MV08900011
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/11960
Appears in Collections:理论物理所1978-2010年知识产出_期刊论文

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Recommended Citation:
FENG, SP,SU, ZB,YU, L. FERMION-SPIN TRANSFORMATION TO IMPLEMENT THE CHARGE-SPIN SEPARATION[J]. PHYSICAL REVIEW B,1994,49(4):2368-2384.
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