報告題目：3D negative electronic compressibility in perovskite iridates
　　報告人：Rui-Hua He (何睿華)
　　地點：格致中樓400
　　時間：2018年1月8日（星期一）上午10:30
　　報告摘要：A central theme of modern condensed matter physics is to understand old and discover new emergent phenomena in quantum materials. These phenomena emerge through the collective behavior of electrons due to their mutual interactions (correlations). In this talk, I will present evidence for the first experimental cases of a new emergent phenomenon in solids—3D negative electronic compressibility. The occurrences of this phenomenon in two perovskite iridate systems are understood to be driven by the electron correlations that are intimately connected with the antiferromagnetism and pseudogap phenomena. All these phenomena in the systems are shown to derive from a special insulating phase in a way that resembles the classic metal-insulator transitions seen on the 2D electron/hole gases in semiconductor heterostructures. Our finding opens the door to an uncharted territory of negative compressibility research that potentially features a whole variety of bulk quantum materials and promises unique applications in low-power nanoelectronics and novel metamaterials.
　　報告人簡介：何睿華，2001（2004）年復(fù)旦大學學士（碩士），2010年美國斯坦福大學應(yīng)用物理學博士，2010-2012年美國勞倫斯伯克利國家實驗室先進光源博士后，2012年起任美國麻省波士頓學院物理系助理教授，2017年被聘為西湖大學浙江西湖高等研究院理學研究所研究員。長期從事實驗?zāi)蹜B(tài)物理基礎(chǔ)研究，主要使用基于同步輻射X射線和真空紫外光的多種實驗手段去研究強關(guān)聯(lián)電子材料中的各種演生現(xiàn)象。在一流學術(shù)雜志共發(fā)表論文共34篇，包括以第一作者發(fā)表在Science 1篇，Nature Physics 2篇和Physical Review Letters 等3篇，以通訊作者發(fā)表在Nature Materials, Nature Communications等5篇，以及在Nature Physics受邀研究綜述1篇。論文累計被引用約2600次，H指數(shù)23。2015年美國國家科學基金杰出青年學者，現(xiàn)兼任英國自然出版集團旗下《科學報告》等雜志學術(shù)編委。
　　歡迎廣大師生踴躍參加！

理學院
2018年1月4日