物理學院“博約學術(shù)論壇”系列報告第150期(2018年第12期)
題目:Topological semimetals and their materials
報告人:翁紅明 中科院物理所研究員
時間:2018年4月25日(周三) 下午4:00
地點:北京理工大學中心教學樓610
摘要:
Topological semimetals (TSMs), characterized by Weyl/Dirac nodes in the bulk and Fermi arcs on their surfaces, are new states of three-dimensional quantum matters. They represent the extension of the topological classification of matters from insulator to metal. The low energy excitation in Dirac/Weyl semimetals (WSM) behaves in the similar way as the massless Dirac/Weyl fermions described by Dirac/Weyl equation. The Weyl fermions have certain chirality and have not been discovered since Hermann Weyl proposed them nearly 88 years ago. The recent discovery of their quasiparticles in solids has inspired broad and intensive studies in the field of TSMs. Notably, the Lorentz invariance assumed in high-energy field theory is broken in solids, which leads to more unconventional quasiparticles beyond the traditional classification of Dirac-Weyl-Majorana fermions. This greatly enriches the quantum states of TSM family, including Node-Line semimetal, type-II WSM, multiple-degenerate nodal point semimetal, etc. In this talk, I will introduce our theoretical predictions of realistic materials to host these intriguing quantum states, as well as their experimental progresses. The TSM family and their relationship with each other are discussed and summarized.
簡歷:
翁紅明,,中科院物理所研究員,,博士生導(dǎo)師。2005年畢業(yè)于南京大學物理學系,獲博士學位,。2005~2010年,在日本留學,、訪問,,先后任博士后、助理教授等,,曾獲日本學術(shù)振興會(JSPS)博士后獎學金,。2010年獲物理所“百人計劃”回國工作,2014年獲基金委優(yōu)秀青年基金資助,,2017年獲日本仁科紀念財團“仁科芳雄亞洲獎”和中科院青年科學家獎,。主要從事計算凝聚態(tài)物理研究,發(fā)展新型材料計算方法和程序,,應(yīng)用于拓撲量子物態(tài)和拓撲材料計算等,。迄今發(fā)表SCI論文110余篇,共被引用7800余次,,單篇引用超100次的有17篇,。“理論預(yù)言并實驗發(fā)現(xiàn)外爾半金屬”的工作入選英國物理學會《物理世界》2015年十大突破,、入選美國物理學會《物理》2015年度八大亮點工作,、入選2015年中國科學十大進展、入選2018年美國物理學會Physical Review系列期刊創(chuàng)刊125周年紀念文集,。理論預(yù)言的三重簡并點半金屬被實驗證實,,入選2017年中國科學十大進展。
聯(lián)系方式:物理學院辦公室 (68913163)
邀請人:劉鋮鋮
網(wǎng) 址:http://physics.bit.edu.cn/