论文标题
蜂窝局部SU中的电荷不可压缩性和Mott差距（4）Hubbard模型：扭曲双层石墨烯系统的课程
Onset of charge incompressibility and Mott gaps in the Honeycomb-Lattice SU(4) Hubbard Model: Lessons for Twisted Bilayer Graphene systems
论文作者
论文摘要
我们使用有限的温度强耦合膨胀来计算蜂窝状晶体SU（4）Hubbard模型的热力学特性。我们为各种特性提供了数值结果，包括化学势，可压缩性，熵和比热的热量，以数字$ u/t $值的温度和密度函数。随着整数密度降低温度，我们研究了电荷不可压缩性的发作和Mott Gaps。在不可压缩的莫特（Mott）政权中，将膨胀重铸成具有SU（4）对称性的广义自旋模型的高温膨胀，然后将其用于研究T/U中强耦合扩展的收敛性。我们讨论了可以从简单的哈伯德模型的高温特性中汲取的课程，内容涉及扭曲的双层石墨烯（TBG）和其他魔术 - 角式扁平频段系统。
We use finite temperature strong coupling expansions to calculate thermodynamic properties of the Honeycomb-lattice SU(4) Hubbard model. We present numerical results for various properties including chemical potential, compressibility, entropy and specific heat as a function of temperature and density at several $U/t$ values. We study the onset of charge incompressibility and Mott gaps as the temperature is lowered at integer densities. In the incompressible Mott regime, the expansions are recast into a high temperature expansion for a generalized spin model with SU(4) symmetry, which is then used to study the convergence of strong coupling expansions in t/U. We discuss lessons that can be drawn from high temperature properties of a simple Hubbard model regarding Twisted Bilayer Graphene (TBG) and other magic-angle flat-band systems.
