Quantum phase transitions of the S=1 Shastry-Sutherland model

TL;DR

This paper explores quantum phase transitions in the two-dimensional S=1 Shastry-Sutherland model, revealing how different spin gap phases connect and examining the impact of single-ion anisotropy using exact diagonalization and series expansion methods.

Contribution

It provides new insights into the phase structure of the S=1 Shastry-Sutherland model and the effects of anisotropy, which were not previously well understood.

Findings

Identification of adiabatic connections between chain and 2D spin gap phases

Analysis of the influence of single-ion anisotropy on phase transitions

Application of exact diagonalization and series expansion methods to this model

Abstract

We investigate quantum phase transitions of the two-dimensional S=1 Shastry-Sutherland model, which is characterized by the frustrated orthogonal-dimer structure, by means of the exact diagonalization method and the Ising-type series expansion method. We clarify how distinct spin gap phases realized in the chain system are adiabatically connected to those in the two-dimensional Shastry-Sutherland model. The effect of single-ion anisotropy is also discussed.