物理学报2024，Vol.73Issue(2)：13-22,10.DOI:10.7498/aps.73.20231231
弯曲应变下六角晶格量子反铁磁体的赝朗道能级
Pseudo-Landau levels of hexagonal lattice quantum antiferromagnets under bending strain
摘要
Abstract
The pseudo-Landau energy levels of a hexagonal lattice quantum antiferromagnet under bending strain are studied by linear spin-wave theory(LSWT)and quantum Monte Carlo method(QMC).Using the linear spin wave theory,the magnetic pseudo-Landau energy level can be found to appear at the high-energy end of the magnon spectrum,and the energy level spacing is proportional to the square root of the energy level index.The linear spin wave theory and the quantum Monte Carlo method both indicate that at the same size,the local magnetization gradually weakens with the gradual increase of the strain strength.Additionally,the antiferromagnetic order continuously weakens in the y-direction under the same strain strength.This occurs because the Heisenberg chain on the upper boundary becomes decoupled into an isolated vertical chain,leading to the destruction of the magnetic order near the upper boundary.The quantum Monte Carlo method provides a more accurate antiferromagnetic sequence evolution,that is,the vertical correlation at the upper boundary is unchanged and the horizontal correlation increases under a specific strain intensity.This affects the magnetization intensity,so that the local magnetization shows an upward trend at the upper boundary.The results contribute to the understanding of the effect of bending strain on spin excitations,and this effect may be observed in two-dimensional quantum magnetic material experiments.关键词
弯曲应变/赝朗道能级/线性自旋波理论/量子蒙特卡罗方法Key words
bending strain/pseudo-Landau levels/linear spin-wave theory/quantum Monte Carlo method引用本文复制引用
解晓洁,孙俊松,秦吉红,郭怀明..弯曲应变下六角晶格量子反铁磁体的赝朗道能级[J].物理学报,2024,73(2):13-22,10.基金项目
国家自然科学基金(批准号:11774019,12074022)和中央高校基本科研业务费(批准号:FRF-BR-16-014A)资助的课题. Project supported by the National Natural Science Foundation of China(Grant Nos.11774019,12074022)and the Fundamental Research Fund for the Central Universities,China(Grant No.FRF-BR-16-014A). （批准号:11774019,12074022）
