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- W2921317907 abstract "A clear consensus on how long it takes a particle to tunnel through a potential barrier has never been so urgently required, since the electron dynamics in strong-field ionization can be resolved on attosecond time-scale in experiment and the exact nature of the tunneling process is the key to trigger subsequent attosecond techniques. Here a general picture of tunneling time is suggested by introducing a quantum travel time, which is defined as the ratio of the travel distance to the expected value of the velocity operator under the barrier. Specially, if applied to rectangular barrier tunneling, it can retrieve the Buttiker-Landauer time $tau_{BL}$ in the case of an opaque barrier, and has a clear physical meaning in the case of a very thin barrier wherein $tau_{BL}$ can not be well defined. In the case of strong-field tunneling process, with the help of the newly defined time, the tunneling delay time measured by attoclock experiment can 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 dependence of tunneling delay time in deep tunneling regime is observed, 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." @default.
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- W2921317907 date "2019-03-16" @default.
- W2921317907 modified "2023-10-16" @default.
- W2921317907 title "Wavelength Dependent Tunneling Delay Time" @default.
- W2921317907 hasPublicationYear "2019" @default.
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