Square-root higher-order Weyl semimetals

TL;DR

This paper introduces a novel square-root higher-order Weyl semimetal model that exhibits unique surface and hinge states, demonstrated through theoretical construction and experimental realization in 3D electric circuits, expanding the scope of topological materials.

Contribution

It proposes the first model of square-root higher-order Weyl semimetals and demonstrates their realization in electric circuits, bridging nonlinear operators and topological phases.

Findings

Hosts Fermi-arc surface and hinge states connecting Weyl points

Theoretical construction of SHOWS from parent Hamiltonians

Experimental observation in 3D stacked electric circuits

Abstract

The mathematical foundation of quantum mechanics is built on linear algebra, while the application of nonlinear operators can lead to outstanding discoveries under some circumstances. In this Letter, we propose a model of square-root higher-order Weyl semimetal (SHOWS) by inheriting features from its parent Hamiltonians. It is found that the SHOWS hosts both "Fermi-arc" surface and hinge states that connect the projection of the Weyl points. We theoretically construct and experimentally observe the exotic SHOWS state in three-dimensional (3D) stacked electric circuits with honeycomb-kagome hybridizations and double-helix interlayer couplings. Our results open the door for realizing the square-root topology in 3D solid-state platforms.