Xiaodong Cui

The University of Hong Kong

Xiaodong Cui

Spin polarization in monolayer tungsten dichalcogenides



The monolayers of group VI transition metal dichalcogenides feature a valence band spin splitting with opposite sign in the two valleys located at corners of 1st Brillouin zone. This spin-valley coupling, particularly pronounced in tungsten dichalcogenides, can benefit potential spintronics and valleytronics with the important consequences of spin-valley interplay and the suppression of spin and valley relaxations. In this talk we discuss the spin-valley coupling in monolayers and multilayers WS2. We explored the interplay of spin and valley degrees of freedom with photocurrent experiments and ultrafast pump-probe spectroscopy. We report our recent experimental findings on the spin transport and valley relaxation process.


CV of  Xiaodong Cui


Academic Qualifications

September 1997 December 2001, Ph.D., Arizona State University

September 1992 July 1997, B.Sc., University of Science and Technology of China

Present Academic Position

July 2014 Present, Professor, Department of Physics, University of Hong Kong

Previous Academic Positions

November 2004 June 2014, Assistant/Associate Professor, Department of Physics, University of Hong Kong

Jan 2002 - Sept 2004, Postdoctoral scientist, Columbia University & T.J. Watson research center, IBM

Previous Relevant Research Works

Experimental solid state physics with an emphasis on characterizing electric and optical properties of low dimensional materials.



Outstanding Young Researcher, University of Hong Kong, 2010

Croucher Senior Fellow, Croucher Foundation,   2017


Publication records:

Five Representative Papers in Recent Five Years (* corresponding author)

(1)  Lu Xie, Xiaodong Cui*; Manipulating spin-polarized photocurrents in 2D transition metal dichalcogenides,  PNAS 113 (14), 37463750 (2016).

(2)  Bairen Zhu, Xi Chen, Xiaodong Cui*; Exciton binding energy of monolayer WS2, Scientific Reports 5,  9218 (2015)

Cited by 115 time as of Oct 2016

(3)  Bairen Zhu, Hualing Zeng, Junfeng Dai, Zhirui Gong, Xiaodong Cui*; Anomalously robust valley polarization and valley coherence in bilayer WS2,  PNAS 111, 11606 (2014)

Cited by 52 time as of Oct 2016

(4)  Hualing Zeng, Gui-Bin Liu, Junfeng Dai,Yajun Yan, Bairen Zhu, Ruicong He, Lu Xie, Shijie Xu, Xianhui Chen, Wang Yao, Xiaodong Cui* Optical signature of symmetry variations and spin-valley coupling in atomically thin tungsten dichalcogenides; Scientific Reports, 10.1038, (2013)

     Cited by 275 time as of Oct 2016

(5)  Hualing Zeng, Junfeng Dai, Wang Yao, Di Xiao, Xiaodong Cui*; Valley polarization in MoS2 monolayers by optical pumping, Nature Nanotechnology, 7,490493 (2012)

Cited by 1106 time as of Oct 2016


Web: http://www.physics.hku.hk/people/academic/348