Observation of fractional Chern insulators in a van der Waals heterostructure

Science
E M SpantonAndrea F Young

Abstract

Topologically ordered phases are characterized by long-range quantum entanglement and fractional statistics rather than by symmetry breaking. First observed in a fractionally filled continuum Landau level, topological order has since been proposed to arise more generally at fractional fillings of topologically nontrivial Chern bands. Here we report the observation of gapped states at fractional fillings of Harper-Hofstadter bands arising from the interplay of a magnetic field and a superlattice potential in a bilayer graphene-hexagonal boron nitride heterostructure. We observed phases at fractional filling of bands with Chern indices [Formula: see text] Some of these phases, in [Formula: see text] and [Formula: see text] bands, are characterized by fractional Hall conductance-that is, they are known as fractional Chern insulators and constitute an example of topological order beyond Landau levels.

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Citations

May 2, 2018·Proceedings of the National Academy of Sciences of the United States of America·R Krishna KumarA K Geim
Oct 9, 2018·Physical Review Letters·Yichen HuC L Kane
Nov 9, 2019·Physical Review Letters·Joydeep MajhiSantanu K Maiti
Oct 22, 2019·Physical Review Letters·Valentin CrépelNicolas Regnault
Jun 5, 2020·Nature·Logan W ClarkJonathan Simon
Apr 7, 2018·Science·Cécile Repellin, Nicolas Regnault
Nov 7, 2018·Nature Nanotechnology·Chenhao JinTony F Heinz
May 6, 2019·Physical Review Letters·Ke WangPhilip Kim
May 6, 2019·Physical Review Letters·Koji KudoYasuhiro Hatsugai
Apr 14, 2020·Physical Review Letters·Biao LianJing Wang
Apr 2, 2019·Physical Review Letters·Fengcheng WuA H MacDonald
Dec 6, 2020·Science Advances·Yaping YangArtem Mishchenko
Nov 15, 2020·Nature Communications·Julien BarrierA I Berdyugin
Mar 31, 2021·Physical Review Letters·Yanyan HeDa-Wei Wang
May 5, 2021·Chemical Society Reviews·Yanping LiuXidong Duan
Feb 26, 2019·Nano Letters·Lujun WangChristian Schönenberger

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