相变和临界现象是物理学中困难而有趣，同时充满意外发现的领域。 在相变现象中，大量微观粒子的相互作用与热或量子涨落的竞争起到核心的作用，而相变的行为通常具有普适性，又与相互作用的细节无关。 近年来，在材料研究和各种新的实验研究的驱动下，对量子相变的研究成为人们研究的热点。而量子相变又和经典相变通过普适的映射紧密地联系在一起。 目前我们主要关注:低维系统的量子与经典相变光晶格中冷原子的量子相变, 玻色-爱因斯坦凝聚相关问题研究手段主要有: 重整化群及标度理论，量子与经典Monte Carlo模拟，数值转移矩阵方法等数值方法关于相变研究的一个简单介绍，请参看： 简介，近期研究介绍：量子相变与解禁闭相变Monte Carlo 团簇模拟方法的介绍与实验，欢迎体验： Java 实验室量子Monte Carlo模拟方法： 资料与范例程序

教育部高等学校科学研究优秀成果奖（自然科学奖）2023年二等奖（第一完成人）

代表性工作： (“ * ”为指导的研究生，博后）

1. Zehui Deng*, Lu Liu, Wenan Guo, and Hai-qing Lin, Phys. Rev. Lett. 133, 100402 (2024).

2. Hui Shao*, Wenan Guo, and Anders W. Sandvik, Quantum criticality with two length scales, Science 352, 213 (2016).

3. Yuhai Liu*, Zhenjiu Wang, T. Sato, M. Hohenadler, C. Wang, Wenan Guo, and F. F. Assaad, Superconductivity from the condensation of topological defects in a quantum spin-Hall insulator, Nature Communications 10, 2658 (2019).

4. L. Liu*, H. Shao, Y.-C. Lin, Wenan Guo, and A.W. Sandvik, Random-Singlet Phase in Disordered Two-Dimensional Quantum Magnets, Phys. Rev. X 8, 041040 (2018).

5. Z.J. Wang, Y.-H. Liu*, T. Sato, M. Hohenadler, C. Wang, Wenan Guo, and F.F. Assaad, Doping-Induced Quantum Spin Hall Insulator to Superconductor Transition, Phys. Rev. Lett. 126, 205701 (2021).

6. C.X. Ding, L. Zhang, and Wenan Guo, Engineering Surface Critical Behavior of (2+1)-Dimensional O(3) Quantum Critical Points, Phys. Rev. Lett. 120, 235701 (2018).

7. Yancheng Wang*, Wenan Guo, and Anders W. Sandvik, Anomalous Quantum Glass of Bosons in a Random Potential in Two Dimensions, Phys. Rev. Lett. 114, 105303 (2015).

8. Songbo Jin, Arnab Sen, Wenan Guo, and Anders W. Sandvik, Phys. Rev. B 87, 144406 (2013)(Editor's suggestion).

9. Chengxiang Ding*, Zhe Fu, Wenan Guo, and F. Y. Wu, Critical frontier of the Potts and percolation models on triangular-type and kagome-type lattices II: Numerical analysis, Phys. Rev. E 81, 061111 (2010).

10. X.-T. Wu, N. Izmailian, and Wenan Guo, Finite-size behavior of the critical Ising model on a rectangle with free boundaries, Phys. Rev. E 86, 041149 (2012)

11. Wenan Guo and Henk W. J. Bloete, Finite-size Analysis of the Hard-square Lattice Gas, Phys. Rev. E 66, 046140(2002).

12. Wenan Guo, Bernard Nienhuis, and Henk W.J. Bloete, Exact Characterization of O(n) Tricriticality in Two Dimensions, Phys. Rev. Lett. 96, 045704(2006).

13. Wenan Guo, H. W. J. Bloete, and Y.F. Wu, Phase Transition in the n>2 Honeycomb O(n) Model, Phys. Rev. Lett. 85, 3874(2000).

14. H. W. J. Bloete, Wenan Guo, and Henk J. Hilhorst, Phase Transition in a Two-Dimensional Heisenberg Model, Phys. Rev. Lett. 88, 047203(2002).

15. Hui Shao, Wenan Guo, and Anders W. Sandvik, Monte Carlo Renormalization Flows in the Space of Relevant and Irrelevant Operators: Application to Three-Dimensional Clock Models. Phys. Rev. Lett. 124, 080602(2020).

16. Youjin Deng, Timothy M. Garoni, Wenan Guo, Henk W. J. Bloete, and Alan D. Sokal, Cluster Simulations of Loop Models on Two-Dimensional Lattices, Phys. Rev. Lett. 98, 120601(2007).