Optical absorption spectra of radical anion C60 after light alkali-dopping havebeen studied by using an extended Hubbard model and two distinct induced spectra havebeen obtained. The result is in agreement with the ex...Optical absorption spectra of radical anion C60 after light alkali-dopping havebeen studied by using an extended Hubbard model and two distinct induced spectra havebeen obtained. The result is in agreement with the experimental one. The spectra havebeen assinged theoretically and the reason for the induced spectra generation has beendiscussed.展开更多
运用有限系统密度矩阵重整化群算法(FS-DMRG),研究拓展Bose-Hubbard模型(即在标准BoseHubbard模型的基础上加入最近邻格点间的粒子相互排斥作用V)发生相变的特征。通过计算系统的局域粒子数密度、单粒子能隙以及压缩系数,分析了系统在...运用有限系统密度矩阵重整化群算法(FS-DMRG),研究拓展Bose-Hubbard模型(即在标准BoseHubbard模型的基础上加入最近邻格点间的粒子相互排斥作用V)发生相变的特征。通过计算系统的局域粒子数密度、单粒子能隙以及压缩系数,分析了系统在不同状态下的特征,得到了不同于标准Bose-Hubbard模型的新量子态——Charge Density Wave(CDW)态。通过分析产生特殊粒子分布方式的原因及其物理性质,得出了发生相变的临界条件。展开更多
We study systematically an extended Bose-Hubbard model on the triangular lattice by means of a meanfield method based on the Gutzwiller ansatz. Pair hopping terms are explicitly included and a three-body constraint is...We study systematically an extended Bose-Hubbard model on the triangular lattice by means of a meanfield method based on the Gutzwiller ansatz. Pair hopping terms are explicitly included and a three-body constraint is applied. The zero-temperature phase diagram and a variety of quantum phase transitions are investigated in great detail. In particular, we show the existence and the stability of the pair supersolid phase.展开更多
文摘Optical absorption spectra of radical anion C60 after light alkali-dopping havebeen studied by using an extended Hubbard model and two distinct induced spectra havebeen obtained. The result is in agreement with the experimental one. The spectra havebeen assinged theoretically and the reason for the induced spectra generation has beendiscussed.
文摘运用有限系统密度矩阵重整化群算法(FS-DMRG),研究拓展Bose-Hubbard模型(即在标准BoseHubbard模型的基础上加入最近邻格点间的粒子相互排斥作用V)发生相变的特征。通过计算系统的局域粒子数密度、单粒子能隙以及压缩系数,分析了系统在不同状态下的特征,得到了不同于标准Bose-Hubbard模型的新量子态——Charge Density Wave(CDW)态。通过分析产生特殊粒子分布方式的原因及其物理性质,得出了发生相变的临界条件。
基金supported by the National Natural Science Foundation of China (Grant Nos. 11175018 and 11247251)
文摘We study systematically an extended Bose-Hubbard model on the triangular lattice by means of a meanfield method based on the Gutzwiller ansatz. Pair hopping terms are explicitly included and a three-body constraint is applied. The zero-temperature phase diagram and a variety of quantum phase transitions are investigated in great detail. In particular, we show the existence and the stability of the pair supersolid phase.
