报告题目: |
IASTU Physics Seminars (biweekly):Quantum criticality with two length scales |
报告人: |
郭文安 教授 |
|
北京师范大学
|
报告时间: |
2016-05-18 16:00 |
报告地点: |
Conference Hall 322, Science Building, Tsinghua University |
主办单位: |
高等研究院 |
简介: |
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. |
|
