Quantum criticality and spin liquid phase in the Shastry-Sutherland model

Quantum criticality and spin liquid phase in the Shastry-Sutherland model
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Shastry-Sutherland 模型中的量子临界性和自旋液相

DOI:
10.1103/physrevb.105.l060409
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发表时间:
2021-04
期刊:
影响因子:
3.7
通讯作者:
Wang Ling
Wang Ling
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Yang Jianwei;S;vik Anders W.;Wang Ling

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利用Shastry- Sutherland自旋模型的基态和激发的密度矩阵重整化群方法,我们证明了在先前已知的斑块-单线态和反铁磁态之间存在一个狭窄的量子自旋液相。我们的结论是基于受激平交道口的有限尺度和序参量。结合先前关于确定量子临界和自旋液相候选模型的结果,我们的结果指向一个统一的量子相图,其中确定的量子临界点将一阶跃迁线和无间隙自旋液相分开。受挫Shastry-Sutherland模型接近临界点,但略在自旋液相内,而先前研究的未受挫模型跨越一阶线。我们还认为,最近对SrCu2(BO3)2的热容测量表明,在2.6和3gpa之间的压力下存在所提出的自旋液体。
Using the density-matrix renormalization group method for the ground state and excitations of the Shastry- Sutherland spin model, we demonstrate the existence of a narrow quantum spin liquid phase between the previously known plaquette-singlet and antiferromagnetic states. Our conclusions are based on finite-size scaling of excited level crossings and order parameters. Together with previous results on candidate models for deconfined quantum criticality and spin liquid phases, our results point to a unified quantum phase diagram where the deconfined quantum-critical point separates a line of first-order transitions and a gapless spin liquid phase. The frustrated Shastry-Sutherland model is close to the critical point but slightly inside the spin liquid phase, while previously studied unfrustrated models cross the first-order line. We also argue that recent heat capacity measurements in SrCu2(BO3)2 show evidence of the proposed spin liquid at pressures between 2.6 and 3 GPa.
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