Speaker
Description
Photoelectron spectra from strong-field ionization show features like
energy cutoffs and interference patterns, influenced by direct and
backscattered electrons [1]. The typical cut-offs at 2𝑈𝑝 and 10𝑈𝑝
can be explained within the famous three-step model, while quantum
inter- and intracycle interferences are typically associated with selfinterference
of direct or backscattered, respectively [2,3]. However,
also cross-process interference (CPI) between direct and backscattered
electrons could reveal further insights. To isolate CPI, competing effects
from self-interference must be suppressed, achievable with singlecycle
laser pulses [4] that confine electron emission to a single optical
period. Metallic nanotips further enhance this by restricting electron
motion to one half-space, ensuring strong backscattering [5]. Quantum
simulations predict CEP-dependent photoelectron spectra with
distinct interference patterns. An extended trajectory model confirms
these features originate from CPI, offering insights into the underlying
physical mechanisms.
[1] F. Krausz et al., Reviews of Modern Physics 81, 163-234 (2009)
[2] F. Lindner et al., Physical Review Letters 95, 040401 (2005)
[3] D.G. Arbó et al., Physical Review A 74, 063407 (2006)
[4] M.T. Hassan et al., Nature 530, 66-70 (2016)
[5] S. Zherebtsov et al., Nature Physics 7, 656-662 (2011)
