论文标题
SRCU2（BO3）2中的近距离脱合量子临界点
Proximate deconfined quantum critical point in SrCu2(BO3)2
论文作者
论文摘要
解义量子临界点（DQCP）代表量子问题研究的范式转移，为订单转换提供了“超越兰道”的情况。但是，它的实验意识仍然难以捉摸。使用高压$^{11} $ b NMR测量对量子srcu $ _2 $（bo $ _3 $）$ _ 2 $，我们在这里展示了磁场诱导的plaquette-singlet，可在1.8 gpa上以上1.8 gpa，在1.8 GPA上以极低的温度，$ t $ t $ t $ t _} 0.07 \ rm c} - 过渡的特征随着压力增加而减弱，我们观察到最高压力下的量子临界尺度为2.4 GPa。在模型计算的支持下，我们建议这些观察结果可以通过近距离DQCP诱导临界量子波动和出现的O（3）对称性来解释。我们的发现将DQCP从理论概念到具体的实验平台。
The deconfined quantum critical point (DQCP) represents a paradigm shift in quantum matter studies, presenting a "beyond Landau" scenario for order--order transitions. Its experimental realization, however, has remained elusive. Using high-pressure $^{11}$B NMR measurements on the quantum magnet SrCu$_2$(BO$_3$)$_2$, we here demonstrate a magnetic-field induced plaquette-singlet to antiferromagnetic transition above 1.8 GPa at a remarkably low temperature, $T_{\rm c}\simeq 0.07$ K. First-order signatures of the transition weaken with increasing pressure, and we observe quantum critical scaling at the highest pressure, 2.4 GPa. Supported by model calculations, we suggest that these observations can be explained by a proximate DQCP inducing critical quantum fluctuations and emergent O(3) symmetry of the order parameters. Our findings take the DQCP from a theoretical concept to a concrete experimental platform.
