论文标题
离子玻色 - 哈伯德模型的激发光谱和动量分布
Excitation spectrum and momentum distribution of the ionic Bose-Hubbard model
论文作者
论文摘要
我们通过标准基础运算符方法研究了离子玻色模型模型的激发光谱和动量分布。我们在Mott绝缘子，超流体，电荷密度波和超滤光器相中的随机相近似中得出了Green的功能。激发光谱在超流体和超滤波器相中散布了模式和无间隙的金石模式。我们表明，动量分布在超诺相的区域角和靠近相边界的电荷密度波相处有一个峰值。此外，我们证明了动量分布可以通过孔激发模式的激发光谱和光谱重量来解释。
We investigate the excitation spectrum and momentum distribution of the ionic Bose-Hubbard model by the standard basis operator method. We derive Green's functions in the random phase approximation in Mott insulator, superfluid, charge density wave, and supersolid phases. The excitation spectrum has gapped modes and gapless Goldstone modes in the superfluid and supersolid phases. We show that the momentum distribution has a peak at the zone corner in the supersolid phase and the charge density wave phase close to the phase boundary. In addition, we demonstrate that the momentum distribution can be explained by the excitation spectrum and spectral weights of hole excitation modes.
