Zhou Yiqing, Sheng D N, Kim Eun-Ah
Laboratory of Atomic and Solid State Physics, Cornell University, Ithaca, New York 14853, USA.
Department of Physics and Astronomy, California State University, Northridge, California 91330, USA.
Phys Rev Lett. 2022 Apr 15;128(15):157602. doi: 10.1103/PhysRevLett.128.157602.
Moiré systems provide a rich platform for studies of strong correlation physics. Recent experiments on heterobilayer transition metal dichalcogenide Moiré systems are exciting in that they manifest a relatively simple model system of an extended Hubbard model on a triangular lattice. Inspired by the prospect of the hetero-transition metal dichalcogenide Moiré system's potential as a solid-state-based quantum simulator, we explore the extended Hubbard model on the triangular lattice using the density matrix renormalization group. Specifically, we explore the two-dimensional phase space spanned by the key tuning parameters in the extended Hubbard model, namely, the kinetic energy strength and the further-range Coulomb interaction strengths. We find competition between Fermi fluid, chiral spin liquid, spin density wave, and charge order. In particular, our finding of the optimal further-range interaction for the chiral correlation presents a tantalizing possibility.
莫尔条纹系统为强关联物理的研究提供了一个丰富的平台。近期关于异质双层过渡金属二硫属化物莫尔条纹系统的实验令人兴奋，因为它们展现了一个相对简单的、基于三角晶格的扩展哈伯德模型的模型系统。受异质过渡金属二硫属化物莫尔条纹系统作为基于固态的量子模拟器的潜力前景启发，我们使用密度矩阵重整化群来探索三角晶格上的扩展哈伯德模型。具体而言，我们探索了扩展哈伯德模型中关键调谐参数所跨越的二维相空间，即动能强度和更远程库仑相互作用强度。我们发现了费米流体、手征自旋液体、自旋密度波和电荷序之间的竞争。特别是，我们对手征关联的最优更远程相互作用的发现呈现出一种诱人的可能性。
