报告人：刘辉（斯德哥尔摩大学）

题目：Zero-Field Parafermions and Hall Crystals in Moiré Minibands

时间：2025年10月13日（周一）下午16：00

腾讯ID:930 348 942

联系人：陈川

报告摘要：

After the recent experimental realizations of fractional Chern insulators (FCIs) in moiré materials at zero magnetic field, it has been theoretically predicted that non-Abelian states with Majorana fermion excitations may be realized in the nearly dispersionless minibands of these systems. Here, we provide clear evidence based on many-body exact diagonalization for the even more exotic possibility of moiré-based non-Abelian FCIs exhibiting Fibonacci parafermion excitations, which are superior candidates for topological quantum computing. In addition, we predict the emergence of a zero-field Hall crystal with Hall resistance h/e² arising from a partially filled (ν=2/3) moiré band with Chern number C=2 in twisted double bilayer graphene. Our results hint towards the robustness of moiré-based parafermions and of Hall crystals arising from bands with higher Chern number.

个人简介：

刘辉，本科与硕士毕业于兰州大学物理学院，师从安钧鸿教授；博士毕业于德国莱布尼兹固体材料研究所（IFW Dresden），导师为Cosma Fulga和Jeroen van den Brink教授。现于斯德哥尔摩大学从事博士后研究，合作导师为Emil J. Bergholtz教授。主要研究方向为摩尔体系中的强关联拓扑效应及其竞争物态，目前已在国际主流学术期刊发表论文十余篇。