High-harmonic generation in Su-Schrieffer-Heeger chains
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arXiv
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| Format: | Preprint |
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2019
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| _version_ | 1866913260946587648 |
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| author | Jürß, Hannah Bauer, Dieter |
| author_facet | Jürß, Hannah Bauer, Dieter |
| contents | Su-Schrieffer-Heeger (SSH) chains are the simplest model systems that display topological edge states. We calculate high-harmonic spectra of SSH chains that are coupled to an external laser field of a frequency much smaller than the band gap. We find huge differences between the harmonic yield for the two topological phases, similar to recent results obtained with more demanding time-dependent density functional calculations [D. Bauer, K.K. Hansen, Phys. Rev. Lett. 120, 177401 (2018)]. This shows that the tight-binding SSH model captures the essential topological aspects of the laser-chain interaction (while higher harmonics involving higher bands or screening in the metal phase are absent). We study the robustness of the topological difference with respect to disorder, a continuous phase transition in position space, and on-site potentials. Further, we address the question whether the edges need to be illuminated by the laser for the huge difference in the harmonic spectra to be present. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_1902_04120 |
| institution | arXiv |
| publishDate | 2019 |
| record_format | arxiv |
| spellingShingle | High-harmonic generation in Su-Schrieffer-Heeger chains Jürß, Hannah Bauer, Dieter Optics Mesoscale and Nanoscale Physics Quantum Physics Su-Schrieffer-Heeger (SSH) chains are the simplest model systems that display topological edge states. We calculate high-harmonic spectra of SSH chains that are coupled to an external laser field of a frequency much smaller than the band gap. We find huge differences between the harmonic yield for the two topological phases, similar to recent results obtained with more demanding time-dependent density functional calculations [D. Bauer, K.K. Hansen, Phys. Rev. Lett. 120, 177401 (2018)]. This shows that the tight-binding SSH model captures the essential topological aspects of the laser-chain interaction (while higher harmonics involving higher bands or screening in the metal phase are absent). We study the robustness of the topological difference with respect to disorder, a continuous phase transition in position space, and on-site potentials. Further, we address the question whether the edges need to be illuminated by the laser for the huge difference in the harmonic spectra to be present. |
| title | High-harmonic generation in Su-Schrieffer-Heeger chains |
| topic | Optics Mesoscale and Nanoscale Physics Quantum Physics |
| url | https://arxiv.org/abs/1902.04120 |