Magnetic-field-driven quantum criticality and thermodynamics in trimerized spin-1/2 isotropic XY chain with three-spin interactions

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	Magnetic-field-driven quantum criticality and thermodynamics in trimerized spin-1/2 isotropic XY chain with three-spin interactions
	L. J. Ding; K. L. Yao; H. H. Fu
	2010
发表期刊	Physica Status Solidi B-Basic Solid State Physics
ISSN	0370-1972
卷号	247 期号:9 页码:2274-2283
摘要	The quantum criticality and thermodynamics for the trimerized spin-1/2 isotropic XY chain with three-spin interactions in an external magnetic field are investigated by means of the Green's function theory combined with Jordan-Wigner transformation. The ground-state phase diagrams are explored, in which various phases are identified and described by typical M-h curves. Therein, two cusps emerge for strong three-spin interactions in two gapless phases at low and high fields, respectively. Moreover, the spin correlations and two-site entanglement entropy are calculated for a further understanding of quantum phase transition (QPT). It is also found that the magnetic-field-driven quantum criticality is closely related to the energy spectrum, in which an energy gap responsible for the appearance of 1/3 magnetization plateau can be opened up by three-spin interactions. The critical behavior disappears when the temperature becomes nonzero, yielding only a crossover behavior. In addition, the gapped low-lying excitations are responsible for the observed thermodynamic behaviors, wherein a structure with three peaks in the temperature dependence of specific heat is unveiled. (C) 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
部门归属	[ding, l. j.; yao, k. l.; fu, h. h.] huazhong univ sci & technol, sch phys, wuhan 430074, peoples r china. [yao, k. l.] chinese acad sci, int ctr mat phys, shenyang 110015, peoples r china.;ding, lj (reprint author), huazhong univ sci & technol, sch phys, wuhan 430074, peoples r china;dinglinjie82@126.com klyao@mail.hust.edu.cn
关键词	Quantum Phase Transition Green's Function Method Magnetic Critical Points Behavior Model
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WOS记录号	WOS:000282741400021
引用统计	被引频次：5[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/31073
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	L. J. Ding,K. L. Yao,H. H. Fu. Magnetic-field-driven quantum criticality and thermodynamics in trimerized spin-1/2 isotropic XY chain with three-spin interactions[J]. Physica Status Solidi B-Basic Solid State Physics,2010,247(9):2274-2283.
APA	L. J. Ding,K. L. Yao,&H. H. Fu.(2010).Magnetic-field-driven quantum criticality and thermodynamics in trimerized spin-1/2 isotropic XY chain with three-spin interactions.Physica Status Solidi B-Basic Solid State Physics,247(9),2274-2283.
MLA	L. J. Ding,et al."Magnetic-field-driven quantum criticality and thermodynamics in trimerized spin-1/2 isotropic XY chain with three-spin interactions".Physica Status Solidi B-Basic Solid State Physics 247.9(2010):2274-2283.