### Abstract

The electrical Hall effect is the production, upon the application of an electric field, of a transverse voltage under an out-of-plane magnetic field. Studies of the Hall effect have led to important breakthroughs, including the discoveries of Berry curvature and topological Chern invariants^{1,2}. The internal magnetization of magnets means that the electrical Hall effect can occur in the absence of an external magnetic field^{2}; this ‘anomalous’ Hall effect is important for the study of quantum magnets^{2–7}. The electrical Hall effect has rarely been studied in non-magnetic materials without external magnetic fields, owing to the constraint of time-reversal symmetry. However, only in the linear response regime—when the Hall voltage is linearly proportional to the external electric field—does the Hall effect identically vanish as a result of time-reversal symmetry; the Hall effect in the nonlinear response regime is not subject to such symmetry constraints^{8–10}. Here we report observations of the nonlinear Hall effect^{10} in electrical transport in bilayers of the non-magnetic quantum material WTe_{2} under time-reversal-symmetric conditions. We show that an electric current in bilayer WTe_{2} leads to a nonlinear Hall voltage in the absence of a magnetic field. The properties of this nonlinear Hall effect are distinct from those of the anomalous Hall effect in metals: the nonlinear Hall effect results in a quadratic, rather than linear, current–voltage characteristic and, in contrast to the anomalous Hall effect, the nonlinear Hall effect results in a much larger transverse than longitudinal voltage response, leading to a nonlinear Hall angle (the angle between the total voltage response and the applied electric field) of nearly 90 degrees. We further show that the nonlinear Hall effect provides a direct measure of the dipole moment^{10} of the Berry curvature, which arises from layer-polarized Dirac fermions in bilayer WTe_{2}. Our results demonstrate a new type of Hall effect and provide a way of detecting Berry curvature in non-magnetic quantum materials.

Original language | English (US) |
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Pages (from-to) | 337-342 |

Number of pages | 6 |

Journal | Nature |

Volume | 565 |

Issue number | 7739 |

DOIs | |

State | Published - Jan 17 2019 |

### All Science Journal Classification (ASJC) codes

- General

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## Cite this

*Nature*,

*565*(7739), 337-342. https://doi.org/10.1038/s41586-018-0807-6