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[光物理系列學術報告(第174期)] Does tunneling process cost time?
時間: 2019年06月04日 10:00
地點: 中科院物理所M238會議室
報告人: 李衛東 教授

山西大學理論物理研究所

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.

簡介

     李衛東,山西大學教授、博士生導師。2008年入選教育部新世紀優秀人才計劃,曾任山西大學理論物理研究所副所長,現任山西大學物理電子工程學院副院長、山西省物理學會第十屆理事會常務理事、中國核學會計算物理學會第七屆理事。長期從事與超冷原子相關的量子問題研究,作為主要理論研究人員參與國家重點基礎研究發展計劃(973)、教育部創新引智基地“111”計劃、863計劃等重大項目共5項,主持國家基金面上項目4項,發表PNAS、Phys. Rev. Lett.、Appl. Phys. Lett.、Phys. Rev. A、Phys. Rev. B、Opt. Exp.等SCI收錄論文70余篇,榮獲山西省科學進步二等獎二次。

邀請人:王兵兵 研究員(Tel:82649017)

聯系人:陸  凌 研究員

主辦單位:中國科學院光物理重點實驗室


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