Multi-Dimensional Coherent Spectroscopy of Light-Driven States and their Collective Modes in Multi-Band Superconductors
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arXiv
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| Auteurs principaux: | , , , , |
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| Format: | Preprint |
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2023
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| _version_ | 1866916250789085184 |
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| author | Mootz, Martin Luo, Liang Huang, Chuankun Wang, Jigang Perakis, llias E. |
| author_facet | Mootz, Martin Luo, Liang Huang, Chuankun Wang, Jigang Perakis, llias E. |
| contents | We present a comprehensive theory of light-controlled multi-band superconductivity and apply it to predict distinctive signatures of light-driven superconducting (SC) states in terahertz multi-dimensional coherent spectroscopy (THz-MDCS) experiments. We first derive gauge-invariant Maxwell-Bloch equations for multi-band BCS superconductors. For this, we go beyond previously considered Anderson pseudo-spin precession models to include quantum transport effects. By calculating the THz-MDCS spectra measured experimentally, we then identify unique signatures of finite-momentum Cooper-pairing states that live longer than the laser pulse. These non-equilibrium SC states are characterized by long-lived canting of Anderson pseudo-spins. The pseudo-spin oscillators that describe the properties of these SC states are parametrically driven by both finite-momentum Cooper pairing and by time oscillations of the order parameter relative phase. We show that such strong parametric driving leads to drastic changes in the THz-MDCS spectral shape from the predictions of third-order nonlinear susceptibility calculations. These spectral changes strongly depend on the interband-to-intraband interaction ratio and on the collective modes of the light-driven state. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2310_03950 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Multi-Dimensional Coherent Spectroscopy of Light-Driven States and their Collective Modes in Multi-Band Superconductors Mootz, Martin Luo, Liang Huang, Chuankun Wang, Jigang Perakis, llias E. Superconductivity We present a comprehensive theory of light-controlled multi-band superconductivity and apply it to predict distinctive signatures of light-driven superconducting (SC) states in terahertz multi-dimensional coherent spectroscopy (THz-MDCS) experiments. We first derive gauge-invariant Maxwell-Bloch equations for multi-band BCS superconductors. For this, we go beyond previously considered Anderson pseudo-spin precession models to include quantum transport effects. By calculating the THz-MDCS spectra measured experimentally, we then identify unique signatures of finite-momentum Cooper-pairing states that live longer than the laser pulse. These non-equilibrium SC states are characterized by long-lived canting of Anderson pseudo-spins. The pseudo-spin oscillators that describe the properties of these SC states are parametrically driven by both finite-momentum Cooper pairing and by time oscillations of the order parameter relative phase. We show that such strong parametric driving leads to drastic changes in the THz-MDCS spectral shape from the predictions of third-order nonlinear susceptibility calculations. These spectral changes strongly depend on the interband-to-intraband interaction ratio and on the collective modes of the light-driven state. |
| title | Multi-Dimensional Coherent Spectroscopy of Light-Driven States and their Collective Modes in Multi-Band Superconductors |
| topic | Superconductivity |
| url | https://arxiv.org/abs/2310.03950 |