| A Quantum Monte Carlo Study on Mixed-Spin Chains of 1／2-1／2-1-1 and 3／2-3／2-1-1 |
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| 作者姓名： | XUZhao-Xin ZHANGJun YINGHe-Ping |
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| 作者单位： | [1]ZhejiangInstituteofModernPhysics,ZhejiangUniversity,Hangzhou310027,China [2]PhysicsDepartment,XinjiangUniversity,Urumqi830046,China [3]PhysicsDepaxtment,＂NationalTaiwanUniversity＂,Taipei106,China |
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| 摘 要： | The ground-state and thermodynamic properties of quantum mixed-spin chains of 1/2-1/2-1-1 and 3/2-3/2-1-1 are investigated by a quantum Monte Carlo simulation with the loop-cluster algorithm. For 1/2-1/2-1-1 chain, we find it hastwo phases separated by an energy-gap vanishing point in the ground-state. For 3/2-3/2-1-1 chain,the numerical results show two energy-gap vanishing points isolated by different phases in its ground-state. Our calculations indicate that all these ground state phases can be understood by means of valence-bond-solid picture, and the thermodynamic behavior at finite temperatures is continuous as a function of parameter α=J2/J1.
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| 关 键 词： | 蒙特卡罗模拟 混合自旋链 铁磁性 基态 热力学性质 能隙 |
| 收稿时间： | 2003-03-05 |
A Quantum Monte Carlo Study on Mixed-Spin Chains of
1/2-1/2-1-1 and 3/2-3/2-1-1 |
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| XUZhao-Xin ZHANGJun YINGHe-Ping.A Quantum Monte Carlo Study on Mixed-Spin Chains of
1/2-1/2-1-1 and 3/2-3/2-1-1[J].Communications in Theoretical Physics,2003,40(5):623-630. |
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| Authors: | XU Zhao-Xin ZHANG Jun YING He-Ping |
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| Institution: | 1. Zhejiang Institute of Modern Physics, Zhejiang University,
Hangzhou 310027, China
;2. Physics Department, Xinjiang University, Urumqi 830046, China
;3. Physics Department, “National Taiwan University”,
Taipei 106, China |
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| Abstract: | The ground-state and thermodynamic properties of quantum
mixed-spin chains of 1/2-1/2-1-1 and
3/2-3/2-1-1 are investigated by a quantum Monte Carlo simulation with the loop-cluster algorithm. For
1/2-1/2-1-1 chain, we find it has two phases separated by an energy-gap vanishing point in the ground-state.
For 3/2-3/2-1-1 chain, the numerical results show two energy-gap vanishing points isolated by different phases
in its ground-state. Our calculations indicate that all these ground state phases can be understood by means of
valence-bond-solid picture, and the thermodynamic behavior at finite temperatures is continuous as a function of parameter
α=J2/J1. |
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| Keywords: | ferrimagnetic gap valence-bond-solid (VBS) state |
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