Physics

Giant nonlinear Hall effect in twisted bilayer WTe₂

Z. He and H. Weng

This groundbreaking research showcases a giant nonlinear Hall effect in twisted bilayer WTe₂, highlighting an unprecedented Berry curvature dipole and tunable nonlinear Hall signals. Conducted by Zhihai He and Hongming Weng, this work positions twisted bilayer WTe₂ as a prime candidate for exploring the nonlinear Hall effect.

00:00

Playback language: English

Index

Abstract

This work demonstrates the existence of a giant nonlinear Hall effect in twisted bilayer WTe₂. The Berry curvature dipole in twisted bilayer WTe₂ (θ = 29.4°) reaches ~1400 Å, significantly larger than in previously reported systems. The complex band structure, featuring numerous band anticrossings and inversions near the Fermi level, leads to oscillating nonlinear Hall signals. The effect's large amplitude and tunability highlight twisted bilayer WTe₂ as a promising platform for studying the nonlinear Hall effect.

Publisher

npj Quantum Materials

Published On

Dec 14, 2021

Authors

Zhihai He, Hongming Weng