| Abstract 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 scaling violations which were neither predicted by the new theory nor conform with standard scenarios. In this talk, I will show that this enigma can be resolved by introducing a critical scaling form with two divergent length scales. I will also present simulation results of a quantum magnet with antiferromagnetic and dimerized ground states which 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. |
