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MO: Fachverband Molekülphysik
MO 21: Poster – Interaction with Strong or Short Laser Pulses (joint session A/MO)
MO 21.7: Poster
Wednesday, March 12, 2025, 17:00–19:00, Tent
Cross-process interference in single-cycle electron emission from nanotips — •Anne Herzig, Thomas Fennel, and Lennart Seiffert — Institute of Physics, University of Rostock, 18059 Rostock, Germany
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 2 Up and 10 Up can be explained within the famous three-step model, while quantum inter- and intracycle interferences are typically associated with self-interference 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 single-cycle 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)
Keywords: strong-field ionization; single-cycle pulses; nanotips; interference