何珂

表面物理、半導體物理、自旋電子學、分子束外延、角分辨光電子能譜、掃描隧道顯微鏡

首次實現了寬禁帶半導體GaN表面上磁性超薄膜的分子束外延生長和垂直磁各向異性。成功製備出具有巨大Rashba自旋軌道劈裂表面態的Ag量子阱薄膜並觀測到Rashba劈裂表面態與量子阱態的強烈的相互作用，實驗證明了這種作用的自旋選擇性及其引起的量子阱態的自旋劈裂。實現了Bi2Se3系列三維拓撲絕緣體薄膜的逐層外延生長，首次觀測到三維拓撲絕緣體相對錶面態的雜化導致的能隙打開。2010年獲中科院物理所“科技新人獎”。2011年獲中國科學院盧嘉錫青年人才獎。共發表論文約二十餘篇，其中Phys. Rev. Lett. 5篇（第一作者2篇），Nature Physics 2篇（通訊作者1篇）。曾在美國物理學年會、美國磁學與磁性材料會議（3M會議）等國際會議和研討會上做邀請報告。

代表性論文和邀請報告:

代表性論文

1. Can-Li Song, Yi-Lin Wang, Peng Cheng, Ye-Ping Jiang, Wei Li, Tong Zhang, Zhi Li,Ke He, Lili Wang, Jin-Feng Jia, Hsiang-Hsuan Hung, Congjun Wu, Xucun Ma, Xi Chen, and Qi-Kunxue, “Direct observation of nodes and twofold symmetry in FeSe superconductor”,Science332, 1410 (2011)

2. Jian Wang, Ashley M. DaSilva, Cui-Zu Chang,Ke He, J. K. Jain, Nitin Samarth, Xu-Cun Ma, Qi-Kun Xue, and Moses H. W. Chan,“Evidence for electron-electron interaction in topological insulator thin films”,Phys. Rev. B 83, 245438 (2011)

3. M. H. Liu, C. Z. Chang, Z. C. Zhang, Y. Zhang, W. Ruan,K. He, L. L. Wang, X. Chen, J. F, Jia, S. C. Zhang, Q. K. Xue, X. C. Ma, and Y. Y. Wang,“Electron interaction-driven insulating ground state in Bi2Se3 topological insulators in the two-dimensional limit”,Phys. Rev. B83, 165440 (2011)

4. Y. Zhang, C. Z. Chang,K. He, L. L. Wang, X. Chen, J. F. Jia, X. C. Ma, and Q. K. Xue,“Doping effects of Sb and Pb in epitaxial topological insulator Bi2Se3 thin films: An in situ angle-resolved photoemission spectroscopy study”,Appl. Phys. Lett. 97, 194102 (2010)

5. C. L. Song, Y. L. Wang, Y. P. Jiang, Y. Zhang, C. Z. Chang, L. L. Wang,K. He, X. Chen, J. F. Jia, Y. Y. Wang, Z. Fang, X. Dai, X. C. Xie, X. L. Qi, S. C. Zhang, Q. K. Xue,andX. C. Ma,“Topological insulator Bi2Se3 thin films grown on double-layer graphene by molecular beam epitaxy”,Appl. Phys. Lett.97, 143118 (2010)

6. P. Cheng, C. L. Song, T. Zhang, Y. Y. Zhang, Y. L. Wang, J. F. Jia, J. Wang, Y. Y. Wang, B. F. Zhu, X. Chen, X. C. Ma,K. He, L. L. Wang, X. Dai, Z. Fang, X. C. Xie, X. L. Qi, C. X. Liu, S. C. Zhang, and Q. K. Xue,“Landau quantization of topological surface states in Bi2Se3”,Phys. Rev. Lett. 105, 076801 (2010)

7.K. He, Y. Takeichi, M. Ogawa, T. Okuda, P. Moras, D. Topwal, A. Harasawa, T. Hirahara, C. Carbone, A. Kakizaki, and I. Matsuda,“Direct spectroscopic evidence of spin-dependent hybridization between Rashba-split surface states and quantum-well states”,Phys. Rev. Lett. 104, 156805 (2010)

8. Y. Zhang,K. He, C. Z. Chang, C. L. Song, L. L. Wang, X. Chen, J. F. Jia, Z. Fang, X. Dai, W. Y. Shan, S. Q. Shen, Q. Niu, X. L. Qi, S. C. Zhang, X. C. Ma, and Q. K. Xue,“Crossover of the three-dimensional topological insulator Bi2Se3 to the two-dimensional limit”, Nat. Phys.6, 584 (2010)

9. T. Zhang, P. Cheng, W. J. Li, Y. J. Sun, G. Wang, X.G. Zhu,K. He, L. L. Wang, X. C. Ma, X. Chen, Y. Y. Wang, Y. Liu, H. Q. Lin, J. F. Jia, and Q. K. Xue,“Superconductivity in one-atomic-layer metal films grown on Si(111)”,Nat. Phys.6, 104 (2010)

10. T. Zhang, P. Cheng, X. Chen, J. F. Jia, X. C. Ma,K. He, L. L. Wang, H. J. Zhang, X.Dai, Z. Fang, X. C. Xie, and Q. K. Xue,“Experimental demonstration of topological surface states protected by time-reversal symmetry”,Phys. Rev. Lett. 103, 266803 (2009)

11. Taichi Okuda, Yasuo Takeichi,Ke He, Ayumi Harasawa,AKITOKakizaki, and Iwao Matsuda, “Substrate dependence of anisotropic electronic structure in Ag(111) quantum film studied by angle-resolved photoelectron spectroscopy”,Phys. Rev. B80, 113409 (2009)

12.Ke He, Toru Hirahara, Taichi Okuda, Shuji Hasegawa, Akito Kakizaki, and Iwao Matsuda, “Spin polarization of quantum well states in Ag films induced by the Rashba effect at the surface”,Phys. Rev. Lett.101, 107604 (2008)

13. T. Hirahara, T. Komorida, A. Sato, G. Bihlmayer, E. V. Chulkov,K. He, I. Matsuda, and S. Hasegawa, “Manipulating quantum-well states by surface alloying: Pb on ultrathin Ag films”,Phys. Rev. B 78, 035408 (2008)

14. L. Y. Ma, L. Tang, Z. L. Guan,K. He, K. An, X. C. Ma, J. F. Jia, Q. K. Xue, Y. Han, S. Huang, and F. Liu,“Quantum size effect on adatom surface diffusion”,Phys. Rev. Lett.97, 266102 (2006)

15. L. Xi, L. Y. Ma,K. He, Z. T. Wang, Q. K. Xue, X. D. Xiao, W. M. Lau,“Study of Fe deposition onto root 3 x root 3-Al/Si(111) template by scanning tunneling microscopy”,Surf. Sci 600, 3072 (2006)

16.K. He, L. Y. Ma, X. C. Ma, J. F. Jia, and Q. K. Xue,“Two-dimensional growth of Fe thin films with perpendicular magnetic anisotropy on GaN(0001)”,Appl. Phys. Lett. 88, 232503 (2006)

17.K. He, M. H. Pan, J. Z.Wang, H. Liu, J. F. Jia, Q. K. Xue,“Growth and magnetism of self-organized Co nanoplatelets on Si(111) surface”,Surf. Interface Anal. 38, 1028 (2006)

18. Rui-Fen Dou, Jin-Feng Jia, Mao-Jie Xu, Ming-Hu Pan,Ke He, Li-Juan Zhang, and Qi-Kun Xue, “Growth of single domain monatomic In chain arrays on vicinal Si(001) surface”,Phys. E25, 660 (2006)

19.Ke He, “Influence of magnetic field sweep rate on the hysteresis loops of Ni0.8Fe0.2 / Fe0.5Mn0.5 exchange bias bilayer”,Chin. Phys.15, 449 (2006)

20.K. He, L. J. Zhang, X. C. Ma, J. F. Jia, Q. K. Xue, and Z. Q. Qiu,“Growth and magnetism of ultrathin Fe films on Pt(100)”,Phys. Rev. B 72, 155432 (2005)

21. M. H. Pan,K. He, L. J. Zhang, J. F. Jia, Q. K. Xue, W. Kim, and Z. Q. Qiu,“Structure and magnetism of ultrathin Co film grown on Pt(100)”,J. Vac. Sci. & Technol. A 23, 790 (2005)

邀請報告

1、第56屆磁學與磁性材料大會邀請報告（2011年10月，美國 斯科茨代爾）（The 56th Annual Conference on Magnetism and Magnetic Materials, Scottsdale, USA），題目：GiantanomalousHall effect in diluted magnetic topological insulator with carrier independent ferromagnetic order

2、2011年美國物理學年會邀請報告(2011年3月，美國 達拉斯)（2011 APS march meeting, Dallas, USA），題目：Investigation and manipulation of the electronic properties of magnetically doped topological insulators