2D quantum-path interference in high-harmonic generation driven by highly-bichromatic fields

• URL: http://arxiv.org/abs/2604.12838v2
• Date: Mon, 20 Apr 2026 14:01:17 GMT
• Title: 2D quantum-path interference in high-harmonic generation driven by highly-bichromatic fields
• Abstract summary: We experimentally observe a new type of quantum-path interference, in two-dimensions (2D-QPI), in high-harmonic generation.<n>This type of 2D-QPI offers a novel route to HHG spectroscopy of attosecond electron dynamics.
• Score: 29.23071377799518
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We experimentally observe a new type of quantum-path interference, in two-dimensions (2D-QPI), in high-harmonic generation (HHG) driven by an orthogonally-polarised highly-bichromatic field. This regime is marked by comparable intensities of the two orthogonal colours. In this highly-bichromatic regime, we demonstrate that 2D-QPI is encoded in the measured harmonic intensity modulations with respect to the relative phase of the two-colour field. The modulations of the odd-order harmonics show a monomodal behaviour, whereas the even harmonics are modulated in a bimodal structure. Our calculations using the strong-field approximation and saddle-point method disentangle contributions from multiple quantum orbits in this HHG regime, revealing that the dipole response for both odd and even harmonics inherits the dynamic symmetry of the orthogonally-polarised driving field. This new type of 2D-QPI offers a novel route to HHG spectroscopy of attosecond electron dynamics by lifting up the dimensionality of the quantum paths involved in the interference.

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