Terahertz ionic Kerr effect: Two-phonon contribution to the nonlinear optical response in insulators
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arXiv
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| Autores principales: | , , , , , |
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| Formato: | Preprint |
| Publicado: |
2022
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| Materias: | |
| Acceso en línea: | |
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| _version_ | 1866909232617488384 |
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| author | Basini, Martina Udina, Mattia Pancaldi, Matteo Unikandanunni, Vivek Bonetti, Stefano Benfatto, Lara |
| author_facet | Basini, Martina Udina, Mattia Pancaldi, Matteo Unikandanunni, Vivek Bonetti, Stefano Benfatto, Lara |
| contents | The THz Kerr effect measures the birefringence induced in an otherwise isotropic material by a strong THz pulse driving the Raman-active excitations of the systems. Here we provide experimental evidence of a sizable Kerr response in insulating SrTiO3 due to infrared-active lattice vibrations. Such a signal, named ionic Kerr effect, is associated with the simultaneous excitation of multiple phonons. Thanks to a theoretical modeling of the time, polarization and temperature dependence of the birefringence we can disentangle the ionic Kerr effect from the off-resonant electronic excitations, providing an alternative tunable mechanism to modulate the refractive index on ultrashort time-scales via infra-red active phonons. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2210_14053 |
| institution | arXiv |
| publishDate | 2022 |
| record_format | arxiv |
| spellingShingle | Terahertz ionic Kerr effect: Two-phonon contribution to the nonlinear optical response in insulators Basini, Martina Udina, Mattia Pancaldi, Matteo Unikandanunni, Vivek Bonetti, Stefano Benfatto, Lara Materials Science The THz Kerr effect measures the birefringence induced in an otherwise isotropic material by a strong THz pulse driving the Raman-active excitations of the systems. Here we provide experimental evidence of a sizable Kerr response in insulating SrTiO3 due to infrared-active lattice vibrations. Such a signal, named ionic Kerr effect, is associated with the simultaneous excitation of multiple phonons. Thanks to a theoretical modeling of the time, polarization and temperature dependence of the birefringence we can disentangle the ionic Kerr effect from the off-resonant electronic excitations, providing an alternative tunable mechanism to modulate the refractive index on ultrashort time-scales via infra-red active phonons. |
| title | Terahertz ionic Kerr effect: Two-phonon contribution to the nonlinear optical response in insulators |
| topic | Materials Science |
| url | https://arxiv.org/abs/2210.14053 |