首页|Nearly degenerate ground states of a checkerboard antiferromagnet and their bosonic interpretation

Nearly degenerate ground states of a checkerboard antiferromagnet and their bosonic interpretation

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The spin-1/2 model system with antiferromagnetic(AF)couplings on a J1-J2 checkerboard lattice,known as the planar py-rochlore model,is strongly frustrated and associated with a two-to-one dimensional crossover.Using the Projected Entangled Simplex States tensor network ansatz,we identify a large number of nearly degenerate states in the frustrated region(J1＜J2).Specifically,we find the long-sought crossed-dimer valence bond solid(VBS)state to be the ground state at J1(＜)J2,while various 1D AF correlated states take over the rest.We verify the stability of the VBS state against nematic perturbation.The corresponding bosonic picture provides an intuitive understanding of the low-energy physics.Particularly,it predicts weaker VBS states in the easy-plane limit,which we confirm numerically.Our results clarify the most essential ground state properties of this interesting system and demonstrate the usefulness of bosonic picture in dealing with frustrated magnetism.

tensor networksfrustrated magnetismdimensional crossoverdegenerate states

Haiyuan Zou、Fan Yang、Wei Ku

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Key Laboratory of Polar Materials and Devices(MOE),School of Physics and Electronic Science,East China Normal University,Shanghai 200241,China

Department of Physics,Beijing Institute of Technology,Beijing 100081,China

Tsung-Dao Lee Institute,Shanghai 200240,China

Key Laboratory of Artificial Structures and Quantum Control(Ministry of Education),Shanghai 200240,China

Shanghai Branch,Hefei National Laboratory,Shanghai 201315,China

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National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural science Foundation of ChinaNational Natural science Foundation of ChinaInnovation Program for Quantum Science and Technology

12274126120740311223401612274287120425072021ZD0301900

2024

10.1007/s11433-023-2190-5

中国科学:物理学 力学 天文学(英文版)
中国科学院

中国科学:物理学 力学 天文学(英文版)

CSTPCD
影响因子：0.91
ISSN：1674-7348
年,卷(期)：2024.67(1)
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