C. H. Yan, J. W. Liu, Y. Y. Zhang, J. F. Wang, Z. Y. Wang, P. Wang, Z. D. Zhang, L. L. Wang, X. C. Ma, S. H. Ji, K. He, L. Fu, W. H. Duan, Q. K. Xue, and X. Chen,“Experimental observation of Dirac-like surface states and topological phase transition in Pb1xSnxTe(111) films",Phys. Rev. Lett.112, 186801 (2014).

E. Y. Wang, H. Ding, A. V. Fedorov, W. Yao, Z. Li, Y. F. Lv, K. Zhao, L. G. Zhang, Z. J. Xu, J. Schneeloch, R. D. Zhong, S. H. Ji, L. L. Wang, K. He, X. C. Ma, G. D. Gu, H. Yao, Q. K. Xue, X. Chen, and S. Y. Zhou, "Fully gapped topological surface states in Bi2Se3films induced by a d-wave high-temperature superconductor",Nat. Phys. 9, 621 (2013).

W. Li, H. Ding, Z. Li, P. Deng, K. Chang, K. He, S. H. Ji, L. L. Wang, X. C. Ma, J. P. Hu, X. Chen, and Q. K. Xue, "KFe2Se2is the parent compound of K-doped iron selenide superconductors",Phys. Rev. Lett.109, 057003 (2012).

W. Li, H. Ding, P. Deng, K. Chang, C. L. Song, K. He, L. L. Wang, X. C. Ma, J. P. Hu, X. Chen, and Q. K. Xue, “Phase separation and magnetic order in K-doped iron selenide superconductor”,Nat. Phys. 8, 126 (2012).

C. L. Song, Y. L. Wang, P. Cheng, Y. P. Jiang, W. Li, T. Zhang, Z. Li, K. He, L. L. Wang, J. F. Jia, H. H. Hung, C. J. Wu, X. C. Ma, X. Chen, and Q. K. Xue, “Direct observation of nodes and twofold symmetry in FeSe superconductor”,Science332, 1410 (2011).

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).

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).

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).

Y. S. Fu, T. Zhang, S. H. Ji, X. Chen, X. C. Ma, J. F. Jia, and Q. K. Xue, “Identifying charge states of molecules with spin-flip Spectroscopy”,Phys. Rev. Lett. 103, 257202 (2009).

X. Chen, Y. S. Fu, S. H. Ji, T. Zhang, P. Cheng, X. C. Ma, X. L. Zou, W. H. Duan, J. F. Jia, and Q. K. Xue, “Probing superexchange interaction in molecular magnets by spin-flip spectroscopy and microscopy”,Phys. Rev. Lett. 101, 197208 (2008).

S. H. Ji, T. Zhang, Y. S. Fu, X. Chen, X. C. Ma, J. Li, W. H. Duan, J. F. Jia, and Q. K. Xue, “High-resolution tunneling spectroscopy of magnetic impurity induced bound states in the superconducting gap of Pb thin films”,Phys. Rev. Lett. 100, 226801 (2008).

Y. S. Fu, S. H. Ji, X. Chen, X. C. Ma, R. Wu, C. C. Wang, W. H. Duan, X. H. Qiu, B. Sun, P. Zhang, J. F. Jia, and Q. K. Xue, “Manipulating the Kondo resonance through quantum size effects”,Phys. Rev. Lett. 99, 256601 (2007).