Exploring symmetries in photoelectron holography with two-color linearly
polarized fields
- URL: http://arxiv.org/abs/2203.02487v2
- Date: Wed, 6 Jul 2022 11:50:43 GMT
- Title: Exploring symmetries in photoelectron holography with two-color linearly
polarized fields
- Authors: T. Rook and C. Figueira de Morisson Faria
- Abstract summary: We investigate photoelectron holography in bichromatic linearly polarized fields of commensurate $romega$ and $somega$.
We show that, additionally to the well-known half-cycle symmetry, which is broken for $r+s$ odd, there are reflection symmetries around the field zero crossings and maxima.
We analyze how these features affect the ionization times and saddle-point equations for different bichromatic fields.
- Score: 0.0
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: We investigate photoelectron holography in bichromatic linearly polarized
fields of commensurate frequencies $r\omega$ and $s\omega$, with emphasis on
the existing symmetries and for which values of the relative phase between the
two driving waves they are kept or broken. Using group-theoretical methods, we
show that, additionally to the well-known half-cycle symmetry, which is broken
for $r+s$ odd, there are reflection symmetries around the field zero crossings
and maxima, which may or may not be kept, depending on how both waves are
dephased. The three symmetries are always present for monochromatic fields,
while for bichromatic fields this is not guaranteed, even if $r+s$ is even and
the half-cycle symmetry is retained. Breaking the half-cycle symmetry
automatically breaks one of the other two, while, if the half-cycle symmetry is
retained, the other two symmetries are either \textit{both} kept or broken. We
analyze how these features affect the ionization times and saddle-point
equations for different bichromatic fields. We also provide general expressions
for the relative phases $\phi$ which retain specific symmetries. As an
application, we compute photoelectron momentum distributions for
$\omega-2\omega$ fields with the Coulomb Quantum Orbit Strong-Field
approximation and assess how holographic structures such as the fan, the spider
and interference carpets behave, focusing on the reflection symmetries. The
features encountered can be traced back to the field gradient and amplitude
affecting ionization probabilities and quantum interference in different
momentum regions.
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