Weyl excitonic condensation

TL;DR

This paper predicts a novel Weyl excitonic condensate in a 2D topological lattice, characterized by unique particle-hole pairing, Weyl nodes, and Fermi-arc edge states, with potential experimental realizations.

Contribution

It introduces a new Weyl excitonic condensate state with topological and excitonic features, including chiral Weyl nodes and unconventional pairing symmetry.

Findings

Formation of a Weyl excitonic condensate with particle-hole pairing

Presence of Weyl nodes with opposite pseudo-spin chirality

Unconventional $p_x+ip_y$ pairing near Weyl points

Abstract

We consider a half-filled two-dimensional Su-Schrieffer-Heeger lattice and examine the role of the long-range Coulomb electron-hole attractive interaction. We demonstrate that, under specific conditions, a rare interplay of topological and excitonic-collective behavior emerges as a novel state of matter. A unique Bose-Einstein condensate of excitons forms, exhibiting co-presence of pseudo-spin chiral texture. The emerging complex order-parameter, a particle-hole pairing-gap, has non-zero real and imaginary parts throughout the Brillouin zone (BZ) but vanish separately on two different nodal lines, which intersect at two Weyl points. The Weyl nodes possess opposite pseudo-spin chiralities, which act as source and drain of a Berry-flux associated with the particle-hole pairing-wavefunction, and are the cause of Bogoliubov-deGennes Fermi-arc edge-states. We self-consistently calculate the full momentum-dependence of the particle-hole pairing gap throughout the entire BZ. Near the Weyl points, the pairing gap exhibits the unconventional time-reversal-symmetry breaking $p_x+ip_y$ character. Finally, we discuss general potential experimental realizations of this novel state of matter.