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学术报告     In situ techniques for quantum materials


【报告题目】 In situ techniques for quantum materials
【报 告 人】 贾金锋教授
              上海交通大学物理与天文学院
【时 间】 2019-03-27     4:00 pm (Wedensday)
【地 点】 理工楼801报告厅

【报告摘要】

Recently, quantum materials are the hottest topic in condensed matter physics. As the samples become smaller and smaller, in situ characterizations become more and more important. By combining molecular beam epitaxy (MBE) with STM, ARPES and other techniques, in situ characterizations can be achieved. With atomic precision control of growth, MBE can provide clean and smooth surfaces for STM and ARPES to study. Meanwhile, STM, ARPES and in situ techniques can also provide enough information for MBE to eliminate much of the trial and error during growth, so that one can fabricate the structures that do not exist in nature or cannot be grown by other techniques. Therefore, this kind of combined system can do some unique work which cannot be done by separate instruments.

In this talk, I will introduce several works done with the combined system to demonstrate the strong power of the combination. With help of STM, artificial cluster crystals, i.e. a periodical array of identical nanoclusters can be grown with precise control. Atomically flat Pb thin films, stanene etc. can be grown with MBE and studied with STM. In Pb films on Si(111), we found quantum well states (QWS) form due to the electronic confinement in the film normal direction and novel properties induced by QWS. We also found high quality topological insulator films can be grown with MBE. Standing waves and Landau levels were observed with low temperature STM and demonstrated the existing of the topological surface states and the prohibition of backward-scattering. Topological insulator/superconductor hetero structures are also fabricated for exploring Majorana fermions.

References

1.       J. F. Jia, et al., J. Phys. D-Appl. Phys. V44 (46), 464007 (2011)

2.       Y. Guo, et al., Science 306 (2004) 1915

3.       J.F. Jia, S.C. Li, Y.F. Zhang, Q.K. Xue, J. Phys. Soc. Jpn. 76 (8) (2007) 082001

4.       Mei-Xiao Wang, et al., Science 336, 52-55 (2012)

5.       J.P. Xu, et al., Phys. Rev. Lett. 114, 017001 (2015)

6.       H.H. Sun, et al., Phys. Rev. Lett. 116, 257003 (2016)

7.       F. F. Zhu, et al., Nature Mater. 14, 1020 (2015)

8.       J.F. Ge, et al., Nature Mater. 14, 285–289 (2015)

 
 

 

 

 


【报告人简介】
贾金锋教授1987年本科毕业于北京大学物理系,1992年北京大学物理系获博士学位。先后在日本、美国等重要研究机构工作5年,之后历任中国科学院物理研究所研究员,清华大学教授。现任上海交通大学特聘教授,上海交通大学低维物理与界面工程实验室学术带头人,博士生导师。在SCI收录的杂志上发表文章230多篇,其中Science 4篇,Nature Phys. 3篇,Phys. Rev. Lett. 20篇,Adv. Mater. 5篇,APL/PRB 40多篇,综述文章3篇。文章被引用6000多次。曾获2014年十佳全国优秀科技工作者提名奖,2014年第五届中国侨界(创新成果)贡献,2013年全球华人物理学会“亚洲成就奖”,2011年国家自然科学二等奖(第一获奖人);2011年香港求是科技基金会“杰出科技成就集体奖”;2005年中国科学院杰出科技成就集体奖;2004年国家自然科学二等奖(第三获奖人);2003年北京市科学技术奖一等奖;2001-2002中国科学院“重大创新贡献团队”奖;1997年国家教育委员会科技进步一等奖等重要奖项。中国科学院“百人计划”获得者(2000)、国家杰出青年基金获得者(2003)、国家教育部“长江学者奖励计划”特聘教授(2009)。

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