报告题目

Does tunneling process cost time?

报 告 人

李卫东

山西大学理论物理研究所

报告地点

北京大学物理学院中楼215

报告时间

2019年5月23日 (星期四) 14:30-15:30

联 系 人

彭良友 (Tel: 62765027)

报告摘要

A clear consensus on how long it takes a particle to tunnel through a potential barrier has never been so urgently required, due to the attoscecond time resolution in strong-field ionization experiments. A naïve quantum travel time is introduced by the ratio of the travel distance to the expected value of the velocity operator under the barrier. The validity of this definition is checked by considering the analytical solvable mode, rectangular barrier tunneling. In the case of attoclock experiment, the tunneling delay time could be interpreted as a travel time spent by the electron to tunnel from a point under the barrier to the tunnel exit. In addition, a peculiar oscillation structure in the wavelength dependent tunneling delay time in deep tunneling regime is predicted, which is beyond the scope of adiabatic tunneling picture. This oscillation structure can be attributed to the interference between the ground state tunneling channel and the excited states tunneling channels.

报告人简介：李卫东，山西大学教授、博士生导师。2008年入选教育部新世纪优秀人才计划，曾任山西大学理论物理研究所副所长，现任山西大学物理电子工程学院副院长、山西省物理学会第十届理事会常务理事、中国核学会计算物理学会第七届理事。长期从事与超冷原子相关的量子问题研究，作为主要理论研究人员参与国家重点基础研究发展计划（973）、教育部创新引智基地“111”计划、863计划等重大项目共5项，主持国家基金面上项目4项，发表PNAS、Phys. Rev. Lett.、Appl. Phys. Lett.、Phys. Rev. A、Phys. Rev. B、Opt. Exp.等SCI收录论文70余篇，荣获度山西省科学进步二等奖二次。