We investigate full quantum mechanical evolution of two electrons nonlinearly coupled to quantum phonons and simulate the dynamical response of the system subject to a short spatially uniform optical pulse that couples to dipole-active vibrational modes. Nonlinear electron-phonon coupling can either soften or stiffen the phonon frequency in the presence of electron density. In the former case, an external optical pulse tuned just below the phonon frequency generates attraction between electrons and leads to a long-lived bound state even after the optical pulse is switched off. It originates from a dynamical modification of the self-trapping potential that induces a metastable state. By increasing the pulse frequency, the attractive electron-electron interaction changes to repulsive. Two sequential optical pulses with different frequencies can switch between attractive and repulsive interaction. Finally, we show that the pulse-induced binding of electrons is shown to be efficient also for weakly dispersive optical phonons, in the presence anharmonic phonon spectrum and in two dimensions.
| Language: | English |
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| Keywords: | condensed matter physics, bipolarons, electron-phonon coupling, Cooper pairs, lattice dynamics, optical phonons, pairing mechanisms, superconducting phase transition, ultrafast phenomena, 1-dimensional systems, nonequilibrium systems, Holstein model, ultrafast pump-probe spectroscopy, materials physics, applied physics |
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| Work type: | Article |
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| Typology: | 1.01 - Original Scientific Article |
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| Organization: | FMF - Faculty of Mathematics and Physics
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| Publication status: | Published |
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| Publication version: | Author Accepted Manuscript |
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| Year: | 2024 |
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| Number of pages: | 6 str. |
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| Numbering: | Vol. 132, iss. 10, art. 106001 |
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| PID: | 20.500.12556/RUL-154890  |
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| UDC: | 538.9 |
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| ISSN on article: | 0031-9007 |
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| DOI: | 10.1103/PhysRevLett.132.106001 |
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| COBISS.SI-ID: | 188007683 |
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| Publication date in RUL: | 07.03.2024 |
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| Views: | 595 |
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| Downloads: | 220 |
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