Holographic Angular Streaking of Electrons and the Wigner-Time Delay
- URL: http://arxiv.org/abs/2003.07249v5
- Date: Thu, 13 Aug 2020 19:11:26 GMT
- Title: Holographic Angular Streaking of Electrons and the Wigner-Time Delay
- Authors: Sebastian Eckart
- Abstract summary: A circularly polarized field at a central frequency of $2omega$ gives rise to a sub-cycle interference pattern.
This interference pattern allows for the retrieval of the derivative of the phase of the initial momentum distribution.
The influence of Coulomb interaction after tunneling is investigated quantitatively.
- Score: 0.0
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: For a circularly polarized single-color field at a central frequency of
$2\omega$ the final electron momentum distribution upon strong field ionization
does not carry any information about the phase of the initial momentum
distribution. Adding a weak, co-rotating, circularly polarized field at a
central frequency of $\omega$ gives rise to a sub-cycle interference pattern
(holographic angular streaking of electrons (HASE)). This interference pattern
allows for the retrieval of the derivative of the phase of the initial momentum
distribution after tunneling $\phi^{\prime}_{\mathrm{off}}(p_i)$. A
trajectory-based semi-classical model (HASE model) is introduced which links
the experimentally accessible quantities to
$\phi^{\prime}_{\mathrm{off}}(p_i)$. It is shown that a change in
$\phi^{\prime}_{\mathrm{off}}$ is equivalent to a displacement in position
space $\Delta x$ of the initial wave packet after tunneling. This offset in
position space allows for an intuitive interpretation of the Wigner time delay
$\Delta \tau_W$ in strong field ionization for circularly polarized
single-color fields. The influence of Coulomb interaction after tunneling is
investigated quantitatively.
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