제 목 Using classical wave systems to illustrate topological and pseudo-spin concepts

강 사 Prof. C.T. Chan (Hong Kong University)

시 간 2016년 7월 18일 (월요일) 오전 11시

장 소 제1신공학관 301동 201호

Abstract:

Man-made structures such as photonic crystals and metamaterials can have complex band dispersions in the momentum space. We will show that some geometric and topological properties in the momentum space of some carefully design periodic artificial structures can lead to interesting phenomena. In fact, many modern notions and novel phenomena that were usually considered and discussed as quantum phenomena can be realized in photonic and acoustic metamaterial systems. I will use a few examples to illustrate the ideas. We will show that geometric phases, synthetic gauge flux and topological Weyl points can be realized in electromagnetic and acoustic meta-crystals. We will also see that pseudospin physics, most commonly known in graphene, can also be manifested in classical wave systems. We can construct photonic crystals with pseudospin of 1 (instead of pseudospin of 1/2 as in graphene) which carries some rather intriguing properties. We will see that the topological characteristics and the pseudospin can each lead to unique transport properties.

Biography:

Professor Che Ting Chan received his BSc degree from the University of Hong Kong in 1980. He completed his PhD degree at the University of California at Berkeley in 1985. He joined the Physics Department of HKUST in 1995. Before coming to HKUST, Professor Chan worked at Ames Laboratory in the United States. Professor Chan was a co-winner of an Outstanding Scientific Accomplishment Award (Solid State Physics) in the U.S.A Department of Energy Materials Science Research Competition. He has been a Fellow of the American Physical Society since 1996. In 1999, he was award ed the Michael Gale Medal for Distinguished Teaching, HKUST. In 2000, he was awarded the Achievement in Asia Award by the Overseas Chinese Physics Association. Professor Chan's main research interests include application of first principles and related methods to study the electronic, structural and other physical properties of matter; surface physics; photonic band gaps; and material physics.