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关于10月12日(周五)胡晓学术报告的通知(Physics Department Colloquium)

编辑:phyzt 时间:2018年10月08日 访问次数:262

题目:Synthetic Topology in Graphene and Artificial Graphenes

报告人:胡晓教授 日本国立物质材料研究机构(NIMS),筑波大学

地点: 教十二-201

时间: 1012日,周五,15:00-16:00


Abstract

    Honeycomb lattice has played an important role in the course of fostering topology physics as known from the Haldane model and the Kane-Mele model [1]. Recently, we proposed a new way to derive nontrivial topology based on honeycomb structure with time-reversal symmetry. The first example is to achieve topological photonic crystals made of dielectric materials such as silicon and GaN [2]. We identify a pseudospin degree of freedom in electromagnetic (EM) modes associated with C6v crystalline symmetry, and show that nontrivial topology is induced by photonic p-d band inversion. Recent microwave experiments confirm our theory [3,4]. The idea can be extended to phononic systems, physical waves, and electronic systems including superconductivity. Especially, we investigate graphene with detuned nearest-neighbor hopping energy or nano-hole arrays, and find in the latter case topological edge/interface states protected by energy gap over 1eV [5]. Recent progress and perspectives of the present approach will be discussed.

References

[1] H.-M. Weng, R. Yu, X. Hu, X. Dai and Z. Fang, Adv. Phys. 64, 227 (2015).

[2] L.-H. Wu and X. Hu, Phys. Rev. Lett. 114, 223901 (2015).

[3] Y.-T. Yang, X. Hu and Z.-H. Hang, Phys. Rev. Lett. 120, 217401 (2018).

[4] Y. Li, H. Chen and X. Hu, to appear in Nat. Commun. (arXiv:1801.04395).

[5] T. Kariyado, Y.-C. Jiang, H.-X. Yang and X. Hu, arXiv:1801.03115.


报告人简介:

胡晓教授,世界顶级计划材料纳米结构学研究中心(WPI-MANA)Principal Investigator,日本国立物质材料研究机构(NIMS)研究主管,筑波大学教授,中组部千人计划,东京大学理学博士。他长期从事理论物理研究,曾先后在日本东京大学、东北大学、美国国家标准技术研究所(NIST)等研究机构从事教学科研工作。1996年加盟日本国立物质材料研究机构,2011年入选中组部千人计划。他在铜氧化物高温超导Abrikosov磁通格子的融化相变,本征约瑟夫森结THz电磁波辐射,拓扑超导马约拉纳準粒子探索,新奇拓扑光子晶体和拓扑绝缘体的理论设计等研究领域取得了一系列原创性成果。至今已在Advances in Physics, Advanced Materials, Superconductor Science and Technology等重要期刊发表综述文章。


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