苏州大学

腾讯会议：536-159-352

会议密码：0915

会议链接：https://meeting.tencent.com/dm/W0TcH2CtpBJ6

报告摘要：

In the Shastry-Sutherland model, the ground state of the system is determined by the relative strength of the nearest neighbor and next-nearest neighbor interactions, J and J’ respectively. When the ratio of J/J’ is tuned continuously, it is predicted that the ground state changes from a spin dimer singlet state to a novel, intermediate 4-spin plaquette singlet state, before eventually reaching an antiferromagnet (AFM) state. The transition between the 4-spin plaquette state and the AFM state is predicted to occur at a deconfine quantum critical point (DQCP), which has been intensively studied recently. SrCu2(BO3)2, as an experimental realization of the Shastry-Sutherland model, has thus attracted considerable interests. Recent experimental advances have revealed signatures of a 4-spin plaquette singlet state, and in particular, signatures of a DQCP. However, this intermediate phase also features signatures that clearly deviate from the prediction of the ideal Shastry-Sutherland model. Therefore, the nature of this plaquette phase and how it evolves into other phases require further investigation. Here, I will discuss our recent studies of the quantum phase diagram of the plaquette state by tuning the pressure and magnetic field, using tunnel diode oscillator measurements. Our results reveal the emergence of a sequence of quantum phases once the spin dimer singlet and the plaquette singlet phase are suppressed by the magnetic field.

报告人简介：

史振中，苏州大学特聘教授。2006年于中国科技大学取得学士学位，2013年于美国纽约州立大学布法罗分校取得物理学博士学位，2013年7月至2021年2月期间，先后在美国强磁场国家实验室和美国杜克大学从事博士后研究工作。2021年3月加入苏州大学物理科学与技术学院。主要从事极端条件下的凝聚态物理实验研究，领域涵盖非常规超导体和量子磁体的低温强磁场物理性质。

邀 请 人：周 睿 特聘研究员

联 系 人：王慧颖 why@iphy.ac.cn