Low-energy photoelectron interference structure in attosecond streaking.

Area of Science:

• Quantum dynamics
• Attosecond science
• Strong-field physics

Background:

• Photoelectron spectroscopy is crucial for probing electronic structure.
• Attosecond pulses enable the study of ultrafast electron dynamics.
• Interference patterns in photoelectron spectra provide rich information.

Purpose of the Study:

• To theoretically investigate photoelectron dynamics from attosecond pulse ionization in an infrared laser field.
• To identify the origins of interference structures in photoelectron momentum distributions.
• To demonstrate the extraction of ionization dynamics information from these interferences.

Main Methods:

• Numerical solution of the time-dependent Schrödinger equation.
• Application of a semiclassical model to interpret interference patterns.
• Systematic variation of the time delay between attosecond and infrared pulses.

Main Results:

• Complex interference structures were observed in photoelectron momentum distributions.
• The semiclassical model successfully identified the origins of these interference structures.
• Selective enhancement and suppression of interferences were achieved by controlling the time delay.
• Extraction of electron wave-packet phases for linearly and circularly polarized pulses was demonstrated.

Conclusions:

• The study establishes a method for controlling and interpreting attosecond photoelectron interference.
• This technique allows for the retrieval of detailed information about electron ionization dynamics.
• The findings pave the way for advanced attosecond spectroscopy applications.