Yilong HAN    韓一龍

Assistant Professor, Department of Physics

The Hong Kong University of Science and Technology

Office:  Room 4448,  Tel: (852) 2358-7492

Lab:       Room 4129,  Tel: (852) 2358-7524

Fax:      (852) 2358 1652

E-Mail:  yilong(at)ust.hk

CV

Assistant Professor (2007 - ) Department of Physics, HKUST, Hong Kong, China

Postdoc 2004 - 2007  University of Pennsylvania, USA

Ph.D. 1998 - 2003 University of Chicago, USA

B.S. 1994 - 1998 Peking University (Beijing University), China

Research Interests

1. Experimental soft condensed matter physics

We investigate the microscopic structures, interactions, dynamics, pattern formation and phase behaviors of colloids such as micro-ellipsoids and diameter-tunable microgel spheres. Colloids are good model systems of atoms because trajectories of individual particles are measurable by video microscopy and image processing. Currently we are focusing on the melting, freezing, solid-solid transitions, glass transitions and geometrical frustrations of colloids in two dimensions, three dimensions and thin films.

2. Statistical physics

We apply the complex-network analysis to phase-space studies and discovered that the phase spaces of some frustration spin models and lattice gas models share some common features. They established a new class of network with unique topology. We are also interested in configurational temperatures and Brownian motions.

math by-products: I discovered a new class of matrixes (phase-space network matrixes) whose eigenvalues have Gaussian distributions. (This is the second class of matrixes with a simple analytical eigenvalue distribution. The first class is random matrixes with semicircular eigenvalue distributions, i.e. Wigner's semicircle law.) Phys. Rev. E 80, 051102 (2009). I constructed a one-to-one mapping between 2D jigsaw-puzzle tiling and 3D stack of spheres. Phys. Rev. E 81, 041118 (2010)

(pdf: poster1, poster2)

Selected Publications:

 

Imaging the homogenous nucleation during the melting of superheated colloidal crystals, Ziren Wang, Feng Wang, Yi Peng, Zhongyu Zheng, and Yilong Han*, Science 338, 87 (2012) pdf

Glass transitions in quasi-two-dimensional suspensions of colloidal ellipsoids, Zhongyu Zheng, Feng Wang and Yilong Han*, Phys. Rev. Lett. 107, 065702 (2011) (highlighted by Editor's Suggestion   and Physics Viewpoint )

Melting of Colloidal Crystal Films, Yi Peng, Zi-Ren Wang, Ahmed Alsayed, Arjun Yodh, and Yilong Han*, Phys. Rev. Lett. 104, 205703 (2010) (featured by Physical Review Focus )
Phase-Space Networks of the Six-Vertex Model under Different Boundary Conditions, Yilong Han*, Phys. Rev. E 81, 041118 (2010) (selected by PRE Kaleidoscope)

Phase-space networks of geometrically frustrated systems Yilong Han*, Phys. Rev. E 80, 051102 (2009)

Geometric frustration in buckled colloidal monolayers Yilong Han*, Yair Shokef*, Ahmed Alsayed, Peter Yunker, Tom C. Lubensky, and Arjun Yodh, Nature, 456, 898-903 (2008). Supplementary Information and movies
Brownian Motion of an Ellipsoid Yilong Han, Ahmed Alsayed, Maurizio Nobili, Jian Zhang, Tom C. Lubensky*, and Arjun G. Yodh, Science 314, 626-630 (2006). Supporting Online Materials
Configurational Temperatures and Interactions in Charge-Stabilized Colloid Yilong Han and David G. Grier*, J. Chem. Phys. 122, 064907, 1-14 (2005).

Configurational Temperature of Charge-Stabilized Colloidal Monolayer Yilong Han and Davide G. Grier*, Phys. Rev. Lett. 92, 148301 (2004)
Confinement-Induced Colloidal Attractions in Equilibrium Yilong Han and Davide G. Grier*, Phys. Rev. Lett. 91, 038302 (2003)
Vortex Rings in a Constant Electric Field Yilong Han and David G. Grier*, Nature 424, 267, (2003) (erratum Nature, 424, 510, 2003)

 

(* denotes corresponding author)

 

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Last update: Oct. 2012 by Yilong Han,  yilong(at)ust.hk
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