标题： 具有两个长度尺度的量子临界性 显示英文标题

标题： Quantum criticality with two length scales

摘要： 无禁闭量子临界点的理论描述了在温度T = 0时超出标准范式的相变，预测了某些有序状态之间的连续转变，而传统理论则要求不连续性。 然而，大量的计算机模拟并未提供这种转变的证据，而是发现了与预期标度关系偏离的现象，这些现象既未被DQC理论预测，也不符合标准情景。 在这里，我们表明，通过引入具有两个发散长度尺度的临界标度形式，可以解决这个谜题。 具有反铁磁和二聚化基态的量子磁体的模拟验证了这一形式，证明了具有无禁闭激发的连续转变，并且也解释了T > 0时的异常标度。 我们的发现修改了对于量子临界性的普遍范式，可能对许多强关联材料产生深远的影响。 显示英文摘要

摘要： The theory of deconfined quantum critical points describes phase transitions at temperature T = 0 outside the standard paradigm, predicting continuous transformations between certain ordered states where conventional theory requires discontinuities. Numerous computer simulations have offered no proof of such transitions, however, instead finding deviations from expected scaling relations that were neither predicted by the DQC theory nor conform to standard scenarios. Here we show that this enigma can be resolved by introducing a critical scaling form with two divergent length scales. Simulations of a quantum magnet with antiferromagnetic and dimerized ground states confirm the form, proving a continuous transition with deconfined excitations and also explaining anomalous scaling at T > 0. Our findings revise prevailing paradigms for quantum criticality, with potentially far-reaching implications for many strongly-correlated materials.