Hall effects in artificially corrugated bilayer graphene without breaking time-reversal symmetry

Sheng Chin Ho, Ching Hao Chang, Yu Chiang Hsieh, Shun Tsung Lo, Botsz Huang, Thi Hai Yen Vu, Carmine Ortix, Tse Ming Chen*

*此作品的通信作者

研究成果: Article同行評審

1 引文 斯高帕斯(Scopus)

摘要

Strain can be used to modify the band structure—and thus the electronic properties—of two-dimensional materials. However, research has focused on the use of monolayer graphene with a limited lowering of spatial symmetry and considered only the real-space pseudo-magnetic field. Here we show that lithographically patterned strain can be used to create a non-trivial band structure and exotic phase of matter in bilayer graphene. The approach creates artificially corrugated bilayer graphene in which real-space and momentum-space pseudo-magnetic fields (Berry curvatures) coexist and have non-trivial properties, such as Berry curvature dipoles. This leads to the appearance of two Hall effects without breaking time-reversal symmetry: a nonlinear anomalous Hall effect that originates from the Berry curvature dipole, previously only observed in the Weyl semimetal WTe2, and a linear Hall effect that originates from a warped band dispersion on top of Rashba-like valley–orbit coupling and is similar to the recently proposed Magnus Hall effect.

原文English
頁(從 - 到)116-125
頁數10
期刊Nature Electronics
4
發行號2
DOIs
出版狀態Published - 二月 2021

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