Personal
◆Family name / Given name:Xu / Gang
◆Gender / Date of birth / Nationality:Male / May 27, 1983 / China
◆Current Post / Institute:Professor / Wuhan National High Magnetic Field Center, Huazhong University of Science & Technolog
◆Mobile/Email:13007107996 /gangxu#hust.edu.cn, gangx#iphy.ac.cn(#to@)
◆Address:1037 Luoyu Road, Wuhan, Hubei, P.R.China 430074
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Experience and Education
2001.09-2005.7 B.S.Department of Physics, Jinan University, Shandong Province, China
2005.09-2010.7Ph.D. Institute of Physics, CAS, Beijing, China, Advisor: Zhong Fang
2010.07-2014.8 Assistant researcher, Institute of Physics, CAS, Beijing, China
2014.08-2015.1 Associate researcher, Institute of Physics, CAS, Beijing, China
2012.11-2016.8 Postdoc in Stanford University, Supervisor: Shou-Cheng Zhang
2016.10-now Wuhan National High Magnetic Field Center, HUST
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Research interests and highlights:
Materials Computation and condensed matter theory, including the topological materials and topological states such as Chern semimetal, quantum anomalous Hall (QAH) effect and topological superconductivity (TSC); the electronic structures and physical properties of the iron-based superconductors. More than 30 papers published on the high level international journals, including8PRL,2Nat. Nanotech, 1Nat. Phys,1Nat. Communand 2Nano letters. Total citations are more than3500. H-index=20. The detailed publications are at https://scholar.google.com/citations?user=BTtzMdMAAAAJ
◆Topological materials and topological states:1)We have generalized the topological classification from the insulator to semimetal, and predicted that a novel quantum state with topologically unavoidable band-crossing at Fermi level can be realized in ferromagnetic compound HgCr2Se4[1]. This state is a condensed-matter realization of the Weyl fermions in (3+1) D, and should exhibits remarkable features, such as magnetic monopoles, Fermi arcs, as well as QAH effect. This work is published onPRL, and highlighted with a Synopsis on the Physics website. The citation is more than480now.2)We have predicted that crystallineA3Bi (A= Na, K, Rb) are Dirac semimetals with bulk 3D Dirac points protected by crystal symmetry [14]. They possess nontrivial Fermi arcs on the surfaces and can be driven into various topologically distinct phases by explicit breaking of symmetries. This proposal was realized recently, and the citation is more than580now.3)Based on DFT calculations, we first give a new proposal to realize the QAH effect by combining two ferromagnetic insulators, Cr-doped Bi2Te3and GdI2together, which can effectively enhance the Chern insulating band gap and Curie temperature [3]. This work points out a new direction of the application of QAH effect and the design of new electronic devices.4)Based on theab initiocalculations, we propose the realization of the intrinsic QAH effect in the single layer Cs2Mn3F12Kagome lattice, where the band gap is around 20 meV [2]. A simplified tight binding model based on the in-plane ddσ antibonding states is constructed to understand the topological band structures of the system in the paper, which is published onPRL115, 186802 (2015).5)Based onab initiocalculations and the theory analysis, we demonstrate that the three dimensional extended s-wave superconductor Fe1+ySe0.5Te0.5has a metallic topologically nontrivial band structure and exhibits a normal-topological-normal superconductivity phase transition on the (001) surface. In the TSC phase, a Majorana zero mode can be observed at the ends of a magnetic vortex line in the superconducting Fe1+ySe0.5Te0.5. Our results pave an effective way to realize topological superconductivity and Majorana fermions in a large class of superconductors [7] (seePRL117, 047001 (2016)).
◆Electronic structures and physical properties of iron-based superconductors: 1)We have calculated the magnetic diagram of LaOMAs (M=V-Cu), and explained their magnetic ground states from the electronic structure aspect [5]. This paper is selected as ‘Top hundred outstanding scientific and technological papers of china’ in 2008, which is cited more than260now.2)We firstly predicted the stripe anti-ferromagnetic ground state in LaOFeAs, and claim it as the Fermi surfaces nesting induced spin-density-wave state [9].This work is the important paper for Natural Science Prize on iron-basedsuperconductors, which is selected as ‘Top hundred outstanding scientific andtechnological papers of china’ in 2008 and cited almost700.3)From first principles calculations, we show that the magnetic properties at hole-doped side are different from its electron-doped counterparts in BaFe2As2, and identified that it is mainly originated from their asymmetric electronic structure [6]. Their influence on the superconductivity for both doping side is also studied [11].4)By treating the multi-orbital fluctuations with LDA+Gutzwiller method, we are able to predict the correct Fe-As bond length, and theweakened Fe-As bonding strength is exactly corresponding to the observed ‘soft phonon’[10].
Others:Besides the above works, I have done many cooperative studies with many collaborators and groups:1)Large band gapquantum Spin Hall effect in saturated tin-film [13] (citation450);2)Dirac fermions in an antiferromagnetic semimetal [15];3)Circular photogalvanic effect in WSe2[16];4)Linear dichroism photodetector in black phosphorus [17] (citation119).5)Electronic structures studies on KFe2Se2[12] (citation260) BaNi2As2, (Tl, Rb)yFe2-xSe2, MoS2and NaCoO2et al.
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Grant
01/2011-08/2015973 program of China, 2011CB921700
01/2013-12/2015Natural Science Foundation of China, 11204359
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Conference activities
● March meeting 2015“Quantum Anomalous Hall Effect in Magnetic Insulator Heterostructure”
● March meeting 2014“Topological superconductivity at the edge of transition metal dichalcogenides”
● The 11th National Symposium on Superconductivity, Zhejiang University, Hangzhou, China, 2011. Invited talk:Half-metallic surface states and topological superconductivity in NaCoO2from first principles.
● PSI-IOP Joint Workshop, Beijing, China, 2011
● The 9th International Conference on Spectroscopies in Novel Superconductors, Fudan University, Shanghai, China, 2010.
● Beijing International Workshop on Iron-(Nickel)-Based Superconductors, Institute of physics, CAS, Beijing, China, 2008
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Main publications:
[1]Gang Xu,Hongming Weng,ZhijunWang,Xi Dai, andZhong Fang
“Chern semimetal and the quantized anomalous Hall effect in HgCr2Se4”
Phys. Rev. Lett107, 182806 (2011) [Editor's suggestion] (citation 483)
[2]Gang Xu, Biao Lian, Shou-cheng Zhang
“Intrinsic Quantum Anomalous Hall effect in Kagome lattice Cs2LiMn3F12”
Phys. Rev. Lett115, 186802 (2015)
[3]G. Xu, J. Wang, C. Felser, X.-L. Qi, S.-C. Zhang
“Quantum Anomalous Hall Effect in Magnetic Insulator Heterostructure”
Nano letters 15 (3), 2019-2023 (2015)
[4]Gang Xu, Jing Wang, Binghai Yan and Xiao-Liang Qi
“Topological superconductivity at the edge of transition metal dichalcogenides”
Physical Review B90(10), 100505 (2014)
[5]G. Xu, W. Ming, Y. Yao, X. Dai, S.-C. Zhang and Z. Fang
“Doping-dependent phase diagram of LaOMAs (M=V-Cu) and electron-type superconductivity near ferromagnetic instability”
EuroPhysics Letters82, 67002 (June 2008) (citation 262)
[6]Gang Xu, Haijun Zhang, Xi Dai, Zhong Fang
“Electron-hole asymmetry and quantum critical point in hole-doped BaFe2As2”
EuroPhysics Letters84, 67015 (December 2008) (citation 59)
[7]Gang Xu,Biao Lian,Peizhe Tang,Xiao-Liang Qi,Shou-Cheng Zhang
“Topological superconductivity on the surface of Fe-based superconductors”
Phys. Rev. Lett117, 047001 (2016)
[8] Hongtao Yuan*, Zhongkai Liu*,Gang Xu*, Bo Zhou, Sanfeng Wu,et al(Co-first author)
“Evolution of the Valley Position in Bulk Transition-Metal Chalcogenides and their Mono-Layer Limit”
Nano letters16, 4738-4745 (2016)
[9] J. Dong, H. J. Zhang,G. Xu, Z. Li, G. Li,et al
“Competing orders and spin-density-wave instability in La(O1-xFx)FeAs”
EuroPhysics Letters83, 27006 (July 2008) (citation 724)
[10] GuangTao Wang，YumingQian,Gang Xu, Xi Dai, Zhong Fang
“Gutzwiller density functional studies of FeAs-based superconductors: Structure optimization and evidence for a three-dimensional Fermi surface”
Phys. Rev. Lett.104, 047002 (2010) (citation 76)
[11]M. Neupane,P. Richard,Y. M. Xu,K. Nakayama,T. Sato,T. Takahashi,A. V. Fedorov,G. Xu,et al
“Electron-Hole Asymmetry in Superconductivity of Pnictides Originated from the Observed Rigid Chemical Potential Shift”
Phys. Rev. B83, 094522 (2011) (citation 71)
[12]T. Qian,X. P. Wang,W. C. Jin,P. Zhang,P. Richard,G. Xu,et al
“Absence of holelike Fermi surface in superconducting K0.8Fe1.7Se2revealed by ARPES”
Phys. Rev. Lett.106, 187001 (2011) (citation 261)
[13] Yong Xu, Binghai Yan, Hai-Jun Zhang, Jing Wang,Gang Xu, Peizhe Tang, Wenhui Duan, and Shou-Cheng Zhang
“Large-Gap Quantum Spin Hall Insulators in Tin Films”
Phys. Rev. Lett.111, 136804 (2013)(citation 456)
[14]Zhijun Wang,Yan Sun,Xing-Qiu Chen,Cesare Franchini,Gang Xu,et al
“Dirac semimetal and topological phase transitions inA3Bi (A=Na, K, Rb)”
Phys. Rev. B85, 195320 (2012)(citation 586)
[15] Peizhe Tang,Quan Zhou,Gang Xu&Shou-Cheng Zhang
“Dirac fermions in an antiferromagnetic semimetal”
Nature Physics12,1100-1104 (2016)
[16]Hongtao Yuan,Xinqiang Wang,Biao Lian,Haijun Zhang,Xianfa Fang,Bo Shen,Gang Xu,et al
“Generation and Electric Control of Spin-Coupled Valley Current in WSe2”
Nature Nanotechnology9, 851–857(2014)(citation 73)
[17]Hongtao Yuan,Xiaoge Liu,Farzaneh Afshinmanesh,Wei Li,Gang Xu,et al
“Polarization-sensitive broadband photodetector using a black phosphorus vertical p–n junction”
Nature Nanotechnology10, 707–713 (2015)(citation 119)
