【摘 要】
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Empolying large-scale quantum Monte Carlo (QMC) worm algorithm simulations,we determine the phase diagram of the extended hard-core boson Hubbard model on t
【机 构】
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HefeiNationalLaboratoryforPhysicalSciencesatMicroscale,UniversityofScienceandTechnologyofChina,Hefei
【出 处】
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第十九届全国凝聚态理论与统计物理学术会议
论文部分内容阅读
Empolying large-scale quantum Monte Carlo (QMC) worm algorithm simulations,we determine the phase diagram of the extended hard-core boson Hubbard model on the pyrocholore lattice.Our model contains not only the nearest-neighbor hopping and interaction,but also pair creation and annhilation of bosons.We find the U(1) quantum spin liquid phase,existing in the nearest-neighbor hard-core boson model,is robust against the perturbation of the pair creation and annihilation process.Through the measurements of specific heat and other observables,we determine the phase boundary of the extended U(1) quantum spin liquid and the superfluid (ferromagnetic) long-range order phase.The extended U(1) phase has the gapless gauge-photon excitations as those in quantum spin ice.We furthermore find the phase transition between U(1) quantum spin liquid and superfluid is strongly first order when nearest-neighbor hopping is small,but becomes weaker as nearest-neighbor hopping increases,and gives rise to a possibility of gapped quantum spin liquid phase in the vicinity..
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