Unconventional state with two coexisting long-range orders for frustrated Heisenberg model at quantum phase transition

TL;DR

This paper proposes an unconventional quantum state with two coexisting long-range orders in a frustrated 2D Heisenberg model near a phase transition, expanding understanding of possible ground states.

Contribution

It introduces a novel state with dual long-range orders at large damping, analyzed through a self-consistent spherically symmetric approach.

Findings

Identification of a new state with coexisting orders

Analysis near quantum phase transition

Potential relevance for frustrated magnetic systems

Abstract

For the frustrated two-dimensional $S=1/2$ antiferromagnetic Heisenberg model close to quantum phase transition we consider the singlet ground states retaining both translational and SU(2) symmetry. Besides usually discussed checkerboard, spin-liquid and stripe states an unconventional state with two coexisting long-range orders appears to be possible at sufficiently large damping of spin excitations. The problem is treated in the frames of self-consistent spherically symmetric approach.