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FERMION-SPIN TRANSFORMATION TO IMPLEMENT THE CHARGE-SPIN SEPARATION
FENG, SP; SU, ZB; YU, L; FENG, SP , INT CTR THEORET PHYS, POB 586, I-34100 TRIESTE, ITALY.
1994
发表期刊PHYSICAL REVIEW B
ISSN1098-0121
卷号49期号:4页码:2368-2384
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.
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
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
学科领域Physics
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收录类别SCI
WOS记录号WOS:A1994MV08900011
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被引频次:98[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.itp.ac.cn/handle/311006/11960
专题理论物理所1978-2010年知识产出
通讯作者FENG, SP , INT CTR THEORET PHYS, POB 586, I-34100 TRIESTE, ITALY.
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FENG, SP,SU, ZB,YU, L,et al. FERMION-SPIN TRANSFORMATION TO IMPLEMENT THE CHARGE-SPIN SEPARATION[J]. PHYSICAL REVIEW B,1994,49(4):2368-2384.
APA FENG, SP,SU, ZB,YU, L,&FENG, SP , INT CTR THEORET PHYS, POB 586, I-34100 TRIESTE, ITALY..(1994).FERMION-SPIN TRANSFORMATION TO IMPLEMENT THE CHARGE-SPIN SEPARATION.PHYSICAL REVIEW B,49(4),2368-2384.
MLA FENG, SP,et al."FERMION-SPIN TRANSFORMATION TO IMPLEMENT THE CHARGE-SPIN SEPARATION".PHYSICAL REVIEW B 49.4(1994):2368-2384.
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