论文标题
双峰特异性热异常和Bose-Hubbard模型中的相关性
Double-peak specific heat anomaly and correlations in the Bose-Hubbard model
论文作者
论文摘要
考虑到Bose-Hubbard Hamiltonian描述的晶格中玻色子的热力学，我们报告了其特定的热量依赖温度的异常双峰的发生。此功能通常与高几何挫败感有关，也可能是纯粹的竞争的结果。通过采用自我能量功能计算与有限温度的扰动理论相结合，我们提出了一种基于基于残留熵的地面脱落的机制。针对系统eingenvalues之间所有可能过渡的特定热量的一般分解提供了对每个最大性质的洞察力。此外，我们根据模型参数如何根据其光谱特性和原子 - 原子相关函数来修改这些峰的结构。
Considering the thermodynamics of bosons in a lattice described by the Bose-Hubbard Hamiltonian, we report the occurrence of anomalous double peaks in their specific heat dependence on temperature. This feature, usually associated with a high geometrical frustration, can also be a consequence of a purely energetic competition. By employing self-energy functional calculations combined with finite-temperature perturbation theory, we propose a mechanism based on ground-state degeneracies expressed as residual entropies. A general decomposition of the specific heat regarding all possible transitions between the system's eingenvalues provides an insight into the nature of each maximum. Furthermore, we address how the model parameters modify the structure of these peaks based on its spectral properties and atom-atom correlation function.
