Signatures of finite-temperature mirror symmetry breaking in the S = 1 2 Shastry-Sutherland model

摘要: We investigate the finite-temperature properties of $S=\frac{1}{2}$ Shastry-Sutherland Heisenberg model using a quantum typicality method. In intermediate plaquette state region, we naturally expect to realize phase transition associated with breaking mirror symmetry this model. reveal some signatures spontaneous within two-point correlation level at moderate temperatures since constructed typical can sense existence degenerated excited states depending on initial random state. also confirm that local order parameter shows intriguing recovering phenomenon in very low temperatures, which could be understood from nature ground and finite-size systems. feature will disappear; instead, saturated behavior appears thermodynamic limit. discuss relationship recent experimental results ${\mathrm{SrCu}}_{2}{({\mathrm{BO}}_{3})}_{2}$ under high pressures.