“数理论坛”第94期：Peculiarities of 3D Electrons under High Magnetic Field: The Cases of Graphite and Bismuth

报告题目

Peculiarities of 3D Electrons under High Magnetic Field: The Cases of Graphite and Bismuth

报告时间

2019年6月6号上午9：00

报告地点

东区综合楼A1104

报告人

朱增伟

报告人

简介

朱增伟，2003年本科毕业于浙江师范大学。2009年博士毕业于浙江大学。2010.2到2012.7于ESPCI做博士后,从事半金属中的输运研究工作，利用热输运研究其费米面。现到目前为止，在Nat. Phys.，Nat. Commun.，PNAS，Phys. Rev. Lett等期刊上发表50多篇文章。现研究兴趣主要集中在极低温下以及脉冲强磁场等极端条件下的物理现象研究。

报告摘要

A longstanding open question in condensed-matter physics is the fate of the three-dimensional electron gas pushed beyond the quantum limit. In this talk, we will present peculiarities revealed by magnetoresistance on two conventional' semimetals: graphite and bismuth far beyond their quantum limit. In bismuth[1], We observed another threshold magnetic field never encountered before in any other solid. Above this field, Bempty, one or two valleys become totally empty. In graphite [2], We report on a study using a state-of-the-art nondestructive magnet allowing us to attain 90.5 T at 1.4 K, which reveals a new field-induced phase and evidence that the insulating state destroyed at 75 T is an excitonic condensate of electron-hole pairs.

[1] Zengwei Zhu*, et al., Nature Communications 8, 15297 (2017)

[2] Zengwei Zhu* et al., Phys. Rev. X 9, 011058 (2019).

邀请人

王清波副教授

2019年5月28日