Probing ultrafast electron correlations in high harmonic generation
We show here that electron-electron (e-e) interactions that evolve dynamically on ultrafast timescales can be imprinted onto the high harmonic generation (HHG) spectrum driven by intense laser fields, even far from any resonant multielectronic behavior of the medium and over a wide energy range. Spe...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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American Physical Society
2020-07-01
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| Series: | Physical Review Research |
| Online Access: | http://doi.org/10.1103/PhysRevResearch.2.033037 |
| _version_ | 1797211440351805440 |
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| author | Ofer Neufeld Oren Cohen |
| author_facet | Ofer Neufeld Oren Cohen |
| author_sort | Ofer Neufeld |
| collection | DOAJ |
| description | We show here that electron-electron (e-e) interactions that evolve dynamically on ultrafast timescales can be imprinted onto the high harmonic generation (HHG) spectrum driven by intense laser fields, even far from any resonant multielectronic behavior of the medium and over a wide energy range. Specifically, we find that in bi-elliptical HHG, the ellipticities of the bichromatic pumps that maximize/minimize the HHG yield are sensitive to the level of theory describing the process, and considerably shift upon inclusion of e-e interactions. We explore this phenomenon by performing ab initio calculations with varying levels of theory on noble gas (Ar, Kr, and Xe) and molecular (carbon monoxide) systems. Interestingly, the sensitivity to e-e interactions in atomic systems arises due to mean-field Coulomb repulsion, while in molecules the strong laser field also excites ultrafast dynamical correlations. Our approach can be used to benchmark theories for multielectron systems interacting with strong fields. For instance, it can be used to determine the validity of various approximations, such as, the adiabatic exchange-correlation approximation in time-dependent density functional theory. |
| first_indexed | 2024-04-24T10:26:31Z |
| format | Article |
| id | doaj.art-f270907af4684085b84b337746c8a31e |
| institution | Directory Open Access Journal |
| issn | 2643-1564 |
| language | English |
| last_indexed | 2024-04-24T10:26:31Z |
| publishDate | 2020-07-01 |
| publisher | American Physical Society |
| record_format | Article |
| series | Physical Review Research |
| spelling | doaj.art-f270907af4684085b84b337746c8a31e2024-04-12T16:56:46ZengAmerican Physical SocietyPhysical Review Research2643-15642020-07-012303303710.1103/PhysRevResearch.2.033037Probing ultrafast electron correlations in high harmonic generationOfer NeufeldOren CohenWe show here that electron-electron (e-e) interactions that evolve dynamically on ultrafast timescales can be imprinted onto the high harmonic generation (HHG) spectrum driven by intense laser fields, even far from any resonant multielectronic behavior of the medium and over a wide energy range. Specifically, we find that in bi-elliptical HHG, the ellipticities of the bichromatic pumps that maximize/minimize the HHG yield are sensitive to the level of theory describing the process, and considerably shift upon inclusion of e-e interactions. We explore this phenomenon by performing ab initio calculations with varying levels of theory on noble gas (Ar, Kr, and Xe) and molecular (carbon monoxide) systems. Interestingly, the sensitivity to e-e interactions in atomic systems arises due to mean-field Coulomb repulsion, while in molecules the strong laser field also excites ultrafast dynamical correlations. Our approach can be used to benchmark theories for multielectron systems interacting with strong fields. For instance, it can be used to determine the validity of various approximations, such as, the adiabatic exchange-correlation approximation in time-dependent density functional theory.http://doi.org/10.1103/PhysRevResearch.2.033037 |
| spellingShingle | Ofer Neufeld Oren Cohen Probing ultrafast electron correlations in high harmonic generation Physical Review Research |
| title | Probing ultrafast electron correlations in high harmonic generation |
| title_full | Probing ultrafast electron correlations in high harmonic generation |
| title_fullStr | Probing ultrafast electron correlations in high harmonic generation |
| title_full_unstemmed | Probing ultrafast electron correlations in high harmonic generation |
| title_short | Probing ultrafast electron correlations in high harmonic generation |
| title_sort | probing ultrafast electron correlations in high harmonic generation |
| url | http://doi.org/10.1103/PhysRevResearch.2.033037 |
| work_keys_str_mv | AT oferneufeld probingultrafastelectroncorrelationsinhighharmonicgeneration AT orencohen probingultrafastelectroncorrelationsinhighharmonicgeneration |