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DAI Xi 戴希
PhD, Institute of Theoretical Physics, CAS
Tel 2358 7981
Fax 2358 1652
Email daix
Office Room 4445
Professor Xi Dai obtained his Bachelor and Master’s degree (1993 &1996) from Zhejiang University and PhD (1999) from Institute of Theoretical Physics, CAS in China. After graduation, he did postdoctoral research in HKUST, Boston college and Rutegrs University. From 2004-2007, he worked in University of Hong Kong as a research assistant professor. In 2007, he joined institute of physics, CAS as a professor in the theory division. In September 2017, he joined HKUST as a professor in the Department of Physics. Professor Dai received several important awards during the past ten years including the OCPA “Achievements in Asia Award” (2011), the CAS prize for outstanding scientific achievements and the KC Chou foundation “Fundamental Physics Prize” (2014).

Most of professor Dai’s previous research activities are concentrated in two fields. One is to develop computational methods for the electronic structure of the strongly correlated materials. The other one is to search for the topological non-trivial quantum state in realistic materials. In the first research field, with the collaboration with professor Z. Fang, they developed the Gutzwiller density functional theory (LDA+Gutzwiller) and applied it to study many of correlated materials, i.e. ferromagnetic metals, iron based superconductors and topological Kondo insulators. In the second field, together with the collaborating team formed by scientists from both IOP and Stanford University, they have proposed several very important topological insulators, i.e. Bi2Se3, Bi2Te3 and Sb2Te3. They also proposed that magnetic doped topological insulator thin film can realise quantum anomalous Hall effect, which has been confirmed by experiments in 2013. In 2015, professor Dai’s research team predicted the first Wely semimetal material TaAs family, which has soon been confirmed by both photo emission and transport experiments.
Research Areas
 Topological materials, strongly correlated systems, and first principle calculations.
Representative Publications
1. Yuanfeng Xu, Changming Yue, Hongming Weng and Xi Dai, “Heavy Weyl Fermion state in CeRu4Sn6”, Phys. Rev. X7, 011027 (2017).

2. Alexey A. Soluyanov, Dominik Gresch, Zhijun Wang, QuanSheng Wu, Matthias Troyer, Xi Dai and B. Andrei Bernevig, “A New Type of Weyl Semimetals”, Nature 527 , 495-498, (2015).

3. Hongming Weng, Chen Fang, Zhong Fang, B. Andrei Bernevig, and Xi Dai,”Weyl Semimetal Phase in Noncentrosymmetric Transition-Metal Monophosphides”, Phys. Rev. X 5, 011029 (2015)

4. H. Weng, J. Zhao, Z. Wang, Z. Fang and Xi Dai , "Topological Crystalline Kondo Insulator in Mixed Valence Ytterbium Borides." Physical Review Letters 112, 016403 (2014).

5. Z. Wang, Y. Sun, X.-Q. Chen, C. Franchini, G. Xu, H. Weng, X. Dai and Z. Fang, “Dirac semimetal and topological phase transitions in A3Bi (A=Na, K, Rb)”, Physical Review B 85, 195320 (2012).

6. Feng Lu, JianZhou Zhao, Hongming Weng, Zhong Fang, and Xi Dai,“Correlated Topological Insulators with Mixed Valence”, Phys. Rew. Lett. 110, 096401 (2013)

7. Rui Yu, Wei Zhang, Hai-Jun Zhang, Shou-Cheng Zhang, Xi Dai and Zhong Fang, “Quantized Anomalous Hall Effect in Magnetic Topological Insulators”, Science 329, 61, (2010).   

8. H. Zhang, C.-X.Liu, X.-L. Qi, X. Dai, Z. Fang, and S.-C. Zhang,“Topological insulators in Bi2Se3, Bi2Te3 and Sb2Te3 with a single Dirac cone on the surface”, Nature Phys. 5, 438, (2009).

9. X. Deng, L. Wang, X. Dai, and Z. Fang,"Local density approximation combined with Gutzwiller method for correlated electron systems: Formalism and applications", Physical Review B 79, 075114 (2009).

10. X. Dai, S. Y. Savrasov, G. Kotliar, A. Miglori, H. Ledbetter and E. Abrahams, "Calculated phonon spectra of plutonium at high temperatures”, Science 300, 953 (2003).