WebDec 18, 2024 · A second-order topological insulator (SOTI) in d spatial dimensions features topologically protected gapless states at its (d − 2)-dimensional boundary at the intersection of two crystal faces, but is gapped otherwise.As a novel topological state, it has been attracting great interest, but it remains a challenge to identify a realistic SOTI material in … WebDec 22, 2024 · 2D real Chern insulator with ν R = 1 and protected cor- ner zero-modes for a finite sample with P T symmetry 46 . Without these terms, the model only describes a trivial
How are Chern insulators different from Topological insulators?
WebJul 30, 2024 · In this paper, we identify the twisted bilayer $\alpha$-graphyne (tbGPY) at large twisting angle as a real Chern insulator (also known as Stiefel-Whitney insulator) … WebDec 11, 2024 · A Chern insulator or a quantum anomalous Hall state is a topological state with integer Hall conductivity but in absence of the Landau level. It had been well established on various two-dimensional lattices with periodic structure. Here, we report similar Chern insulators that can also be realized on a quasicrystal with fivefold rotational symmetry. … csc scholarship in shenzhen
Pressure-enhanced fractional Chern insulators in moiré
WebApr 3, 2024 · They are known to be holomorphic both in real and momentum spaces, and also exhibit uniform, translationally invariant, geometrical properties in momentum space. ... We show that pressure applied to twisted WSe$_2$ can enhance the many-body gap and region of stability of a fractional Chern insulator at filling $\nu = 1/3$. Our results are … WebThe real Chern number leads to a pair of hinge Fermi arcs, whereas the winding number protects a double drumhead surface bands. We develop a low-energy model for 3D graphdiyne which captures the essential topological physics. Experimental aspects and possible topological transition to a 3D real Chern insulator phase are discussed. WebDec 22, 2024 · About Chern insulator. I know when we talk about Insulator, U (1)charge symmetry naturally exists. "The Chern insulator is not an SPT phase protected by U (1)charge symmetry. In fact, a Chern insulator (and the QHE) is neither topologically ordered (or long-ranged entangled) nor symmetry-protected. It is simply a chiral phase due to … csc scholarship china 2020