On Quantum Solitons in the Sawtooth Lattice

TL;DR

This paper investigates quantum solitons in a sawtooth lattice of a spin-1/2 Heisenberg system, revealing unique degenerate ground states and kink excitations, with implications for low-temperature thermodynamics and material properties.

Contribution

It introduces the study of quantum solitons in the sawtooth lattice, highlighting differences from the railroad trestle lattice and connecting findings to experimental materials.

Findings

Degenerate ground states with kink and antikink excitations.

Distinct low-temperature thermodynamic behavior.

Relevance to Delafossite materials.

Abstract

We study the sawtooth lattice of a coupled spin $1/2$ Heisenberg system, a variant of the railroad trestle lattice. The ground state of this system is two-fold degenerate with periodic boundary conditions and supports kink antikink excitations, which are distinct in this case, unlike the railroad trestle lattice. The resulting low temperature thermodynamics is compared with the recently discovered Delafossites $Y Cu O_{2.5} ~$.