报告信息

唐仲英楼B501
报告日期 : 2016年05月12日
时间: 15:00
报告人: Laura H. Greene

报告题目:Topological surface states interacting with bulk spin excitons in the Kondo insulator SmB6 as revealed by planar tunneling spectroscopy

摘要:

Samarium hexaboride (SmB6), a well-known Kondo insulator in which the insulating bulk arises from strong electron correlations, has recently attracted great attention owing to its possibly topological nature, thereby harboring protected surface states. Although there is strong evidence for this, corroborative spectroscopic evidence is still lacking; unlike in the weakly correlated counterpart, e.g., Bi2Se3. We report planar tunneling spectroscopy results obtained on the (001) and (011) crystal faces that reveal the linear density of states (DOS) as expected for Dirac cones. Our spectroscopic results also reveal the bulk gap, whose signature arises from spin excitons in the bulk interacting with the surface states. Above ~ 4 K, the thermal population of the spin excitons keeps the surface state from being protected.


简 历:

美国科学院院士,现任佛罗里达州立大学教授,美国强磁场实验室主任科学家,于2015年当选美国物理学会主席。其主要从事强关联电子体系和新型高温超导材料的研究。是国际著名的科学活动组织者和教育家,多家学术杂志主编和编委。在国际学术场合作报告400余场,发表学术论文200余篇,论文引用9000余次,h-index 48。获得国际学术奖项和学术组织奖多项。