Wagner Niklas, Guerci Daniele, Millis Andrew J, Sangiovanni Giorgio
Institut für Theoretische Physik und Astrophysik and Würzburg-Dresden Cluster of Excellence ct.qmat, <a href="https://ror.org/00fbnyb24">Universität Würzburg</a>, 97074 Würzburg, Germany.
Center for Computational Quantum Physics, <a href="https://ror.org/00sekdz59">Flatiron Institute</a>, New York, New York 10010, USA.
Phys Rev Lett. 2024 Sep 20;133(12):126504. doi: 10.1103/PhysRevLett.133.126504.
We use a real-space slave-rotor theory of the physics of topological Mott insulators, using the Kane-Mele-Hubbard model as an example, and show that a topological gap in the Green function zeros corresponds to a gap in the bulk spinon spectrum and implies a gapless band of edge zeros and a spinon edge mode. We then consider an interface between a topological Mott insulator and a conventional topological insulator showing how the spinon edge mode of the topological Mott insulator combines with the spin part of the conventional electron topological edge state, leaving a non-Fermi liquid edge mode described by a gapless propagating holon and gapped spinon state. Our work demonstrates the physical meaning of Green function zeros and shows that interfaces between conventional and Mott topological insulators are a rich source of new physics.
我们以凯恩 - 梅勒 - 哈伯德模型为例，运用拓扑莫特绝缘体物理的实空间奴隶转子理论，证明格林函数零点处的拓扑能隙对应于体能隙子谱中的能隙，并暗示存在无隙的边缘零点能带和一个隙子边缘模式。接着，我们考虑拓扑莫特绝缘体与传统拓扑绝缘体之间的界面，展示了拓扑莫特绝缘体的隙子边缘模式如何与传统电子拓扑边缘态的自旋部分相结合，从而留下一个由无隙传播的空穴子和有隙隙子态描述的非费米液体边缘模式。我们的工作揭示了格林函数零点的物理意义，并表明传统拓扑绝缘体与莫特拓扑绝缘体之间的界面是新物理的丰富来源。
