Driving collective current excitations using light: The two-time $GW$ approach
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866916849510252544 |
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| author | Ong, Chin Shen Golež, Denis Rubio, Angel Eriksson, Olle Strand, Hugo U. R. |
| author_facet | Ong, Chin Shen Golež, Denis Rubio, Angel Eriksson, Olle Strand, Hugo U. R. |
| contents | We identify a distinct transverse collective excitation, which we name the "curron", arising from current-current interactions in a driven quantum metal. Unlike plasmons, which involve longitudinal charge oscillations, currons are transverse current-density oscillations resulting from the interplay between the vector potential generated by the current and the external driving field. We demonstrate the emergence of this excitation in sodium metal by solving the Kadanoff-Baym equations on a complex time contour within the non-equilibrium two-time (TT) $GW$ formalism, marking, to our knowledge, the first TT-$GW$ calculation on a realistic material. We further show that two-time quantum memory effects leave measurable signatures: a pump-induced elevation in the baseline of the current-to-field response, potentially observable in polarization- and momentum-resolved conductivity experiments. By extracting effective resistive and memory coefficients from the TT-$GW$ dynamics, we introduce a generalized d'Alembert wave equation that captures the many-body damping and retardation inherent to driven quantum systems. These results establish current-current response functions as a platform to harness qualitatively new collective dynamics in correlated matter, opening new avenues for probing light-matter interactions beyond charge-density dynamics. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2504_00583 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Driving collective current excitations using light: The two-time $GW$ approach Ong, Chin Shen Golež, Denis Rubio, Angel Eriksson, Olle Strand, Hugo U. R. Materials Science We identify a distinct transverse collective excitation, which we name the "curron", arising from current-current interactions in a driven quantum metal. Unlike plasmons, which involve longitudinal charge oscillations, currons are transverse current-density oscillations resulting from the interplay between the vector potential generated by the current and the external driving field. We demonstrate the emergence of this excitation in sodium metal by solving the Kadanoff-Baym equations on a complex time contour within the non-equilibrium two-time (TT) $GW$ formalism, marking, to our knowledge, the first TT-$GW$ calculation on a realistic material. We further show that two-time quantum memory effects leave measurable signatures: a pump-induced elevation in the baseline of the current-to-field response, potentially observable in polarization- and momentum-resolved conductivity experiments. By extracting effective resistive and memory coefficients from the TT-$GW$ dynamics, we introduce a generalized d'Alembert wave equation that captures the many-body damping and retardation inherent to driven quantum systems. These results establish current-current response functions as a platform to harness qualitatively new collective dynamics in correlated matter, opening new avenues for probing light-matter interactions beyond charge-density dynamics. |
| title | Driving collective current excitations using light: The two-time $GW$ approach |
| topic | Materials Science |
| url | https://arxiv.org/abs/2504.00583 |