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        Prof. Kwok Sum CHAN

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          Professor

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Contact Information:

Department of Physics and Materials Science
City University of Hong Kong
Tat Chee Avenue
Kowloon, Hong Kong

Tel: 27887814
Fax: 27887830
Email: apkschan@cityu.edu.hk

 

Profile:

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Prof. K S Chan received his BSc (First Class Honors) and PhD degrees in physics from University of Hong Kong.

He conducted his post-doctoral research in semiconductor quantum well physics at Oxford University and Nottingham University in UK, before he joined City University of Hong Kong. His research interest is theory and modeling of transport, spintronic and optical processes in semiconductor, graphene and superconductor nanostructures.

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His publications include two book chapters and over 100 refereed journal papers.

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He has recently proposed, with QT Zhang and ZJ Lin of University of Science and Technology of China, a method to generate pure spin current and completely spin-polarized current in graphene. The study has been reported in American Institute of Physics public release, Eurekalert, Nanotechweb, Physics World and PhysicsOrg.com. The paper was published in Applied Physics Letters v.98 032106 (2011)

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News Report of our research work on the web:

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NanotechWeb/Physics World:  http://physicsworld.com/cws/article/news/45025

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Research Interest:

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Theoretical and  Modeling  studies in:

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Spintronics, Graphene, Topological Insulators, Superconductors, Nanodevices, Photonic devices, Nanotechnology, Semiconductors

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Theoretical projects for Ph.D. Studies are available in the following areas. For further information about the projects, please contact me by email.

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I.              Nanophotonics (plasmonics): design and model nanophotonic devices based on plasmonic structures.

 

II.            Spintronics  and valleytronics in graphene, semiconductors and topological insulators: study how to manipulate, control and detect spin and valley in the nanostructures of these materials.

 

III.           Floquet Topological insulators: investigate how a.c. perturbation can induce and manipulate topological order

 

IV.          Electronic properties of multi-layer graphene: a study of the special electronic and topological properties of multi-layer graphene ¡@

 

Ph.D studies are usually 4-year long for candidates with a BSc degree, or 3-year for candidates with an MPhil or MSc degree.

 Information can be found at http://www.sgs.cityu.edu.hk/prospective/rpg.

 Application can be submitted through             

                    https://banweb.cityu.edu.hk/pls/PROD/hwskalog_cityu.P_DispLoginNon 

                   

Post-doc Position

Enquiries about post-doc position available are always welcome.¡@

Post-doc Alumni:

J H Wei (now faculty in Renmin University, Beijing)

J Wang (now faculty in Southeast University, Nanjing)

J F Liu (now faculty in South University of Science and Technology of China, Shenzhen)

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Selected Publications:

J Wang H Y Tian Y H Yang and K S Chan ¡§Spin separation in a zigzag graphene nanoribbon junction¡¨ Physical Review B (rapid communication) v.86 081804 (2012)

 

J Wang and K S Chan "Tunneling conductance of a magnetized zigzag graphene nanoribbon/superconductor junction" Physical Review B v.83 125425 (2011)


J F Liu and K S Chan "Relation between symmetry breaking and the anomalous Joesphson effect" Physical Review B v.82 128305 (2010)


J F Liu and K S Chan "Anomalous Josephson current through a ferromagnetic trilayer junction" Physical Review B v.82 184533 (2010)


J F Liu K S Chan and J Wang  ¡§Tunable 0-pi transition by spin precession in Josephson junction¡¨ Applied Physics Letters vol.96 182505 (2010)


K S Chan and J H Wei, ¡§Quantum ballistic transport at nano-wire junctions¡¨ Physical Review B vol.75 125310 (2007).


J Wang and K S Chan ¡§Equilibrium spin current through tunneling junctions¡¨ Physical Review B vol.74 035342 (2006).


J Wang and K S Chan ¡§Spin current in two dimensional electron gas tunneling junction¡¨ Europhysics Letters vol.75 281 (2006)


J Wang and K S Chan ¡§Intrinsic oscillation of spin accumulation induced by Rashba spin-orbital interaction¡¨ Physical Review B vol.73 033316 (2006). 


 J Wang, K S Chan and D Y Xing ¡§Voltage-controllable spin polarization of current: Model of three-terminal spin device¡¨ Physical Review B vol.72 115311 (2005).


L G Wang, W Yang, K Chang and K S Chan ¡§Spin-dependent tunneling through a symmetric semiconductor barrier: the Dresselhaus effect¡¨, Physical Review B v.72 153314 (2005)


J Wang and K S Chan, ¡§Numerical study of the spin Hall current in a quantum wire¡¨ Physical Review B v.72 045331 (2005).


J H Wei and K S Chan ¡§A theoretical analysis of quantum dash structures¡¨ Journal of Applied Physics, v.97 p.123424 (2005)


 K S Chan ¡§Dynamical analysis of carrier concentration in inelastic resonant tunneling¡¨ Applied Physics Letters vol.83 p.692-694 (2003).


W C H Choy and K S Chan ¡§Theoretical Analysis of Diffused Quantum Wells Lasers and Optical Amplifiers¡¨ IEEE Journal of Selected Topics in Quantum Electronics, vol. 9  p.698-707 (2003) [Invited paper]


 W Y Ruan, K S Chan and E Y B Pun, ¡§Ground and doubly excited states of two-dimensional D- centers¡¨ Physical Review B, vol.63, article no: 205204 (2001).


 E H Li, B L Weiss and K S Chan "Effect of interdiffusion on the subbands in an AlGaAs/GaAs single quantum well structure", Physical Review  B vol. 46, 15180-15191, (1992).


B R Snell, K S Chan, F W Sheard, L Eaves, G A Toombs, D K Maude, J  C Portal, S J Bass, P Claxton, G Hill, and M A Pate, "Observation of magneto-quantized interface states by electron tunnelling in single‑barrier n-(InGa)As/InP/n+(InGa)As heterostructure", Physical Review Letters, vol.59, 2806‑2809, (1987).


K S Chan, "The effects of the hole subband mixing on the energies and oscillator strengths of excitons in a quantum well", J. Phys. C : Solid State Phys. vol.19 L125‑130, (1986). 

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