Infinite Berry Curvature of Weyl Fermi Arcs

JHIH-SHIH YOU^1*, Dennis Wawrzik², Jorge I. Facio², Jeroen van den Brink^2,3, Inti Sodemann⁴

¹Department of Physics, National Taiwan Normal University, Taipei, Taiwan
²Institute for Theoretical Solid State Physics, IFW Dresden, Dresden, Germany
³Institut für Theoretische Physik and Würzburg-Dresden Cluster of Excellence ct.qmat, Technische Universität Dresden, Dresden, Germany
⁴Max Planck Institute for the Physics of Complex Systems, Dresden, Germany

* Presenter:JHIH-SHIH YOU, email:jhihshihyou@gmail.com

We show that Weyl Fermi arcs are generically accompanied by a divergence of the surface Berry curvature scaling as 1/k², where k is the distance to a hot line in the surface Brillouin zone that connects the projection of Weyl nodes with opposite chirality, but which is distinct from the Fermi arc itself. Such surface Berry curvature appears whenever the bulk Weyl dispersion has a velocity tilt toward the surface of interest. This divergence is reflected in a variety of Berry curvature mediated effects that are readily accessible experimentally and, in particular, leads to a surface Berry curvature dipole that grows linearly with the thickness of a slab of a Weyl semimetal material in the limit of the long lifetime of surface states. This implies the emergence of a gigantic contribution to the nonlinear Hall effect in such devices.


Reference: Phys. Rev. Lett. 127, 056601 (2021) (Editors' Suggestion)

Keywords: Nonlinear Hall effect, Weyl Fermi arcs , Berry curvature dipole