Physics

Spontaneous time-reversal symmetry breaking in twisted double bilayer graphene

M. Kuiri, C. Coleman, et al.

Delve into the fascinating world of twisted double bilayer graphene (tDBG), where an anomalous Hall effect and spontaneous time-reversal symmetry breaking reveal insights into valley ferromagnetism. This groundbreaking research conducted by Manabendra Kuiri and colleagues explores the intricate coupling of spin and valley properties within a correlated metallic state.

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Playback language: English

Index

Abstract

Twisted double bilayer graphene (tDBG) exhibits an anomalous Hall effect with hysteresis loops demonstrating spontaneously broken time-reversal symmetry, suggesting valley (orbital) ferromagnetism. Resistivity is strongly affected by in-plane magnetic fields, indicating spin-valley coupling or direct orbital coupling. The interplay of band topology and Coulomb interactions is investigated, revealing a correlated metallic state with broken spin and valley symmetries.

Publisher

Nature Communications

Published On

Oct 29, 2022

Authors

Manabendra Kuiri, Christopher Coleman, Zhenxiang Gao, Aswin Vishnuradhan, Kenji Watanabe, Takashi Taniguchi, Jihang Zhu, Allan H. MacDonald, Joshua Folk

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