Observation of van der Waals phonons in the single-layer cuprate (Bi,Pb)$_2$(Sr,La)$_2$CuO$_{6+δ}$
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arXiv
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| Autori principali: | , , , , , , , , , , , , , , , , |
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| Natura: | Preprint |
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2021
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| author | Peng, Y. Y. Boukahil, I. Krongchon, K. Xiao, Q. Husain, A. A. Lee, Sangjun Li, Q. Z. Alatas, A. Said, A. H. Yan, H. T. Ding, Y. Zhao, L. Zhou, X. J. Devereaux, T. P. Wagner, L. K. Pemmaraju, C. D. Abbamonte, P. |
| author_facet | Peng, Y. Y. Boukahil, I. Krongchon, K. Xiao, Q. Husain, A. A. Lee, Sangjun Li, Q. Z. Alatas, A. Said, A. H. Yan, H. T. Ding, Y. Zhao, L. Zhou, X. J. Devereaux, T. P. Wagner, L. K. Pemmaraju, C. D. Abbamonte, P. |
| contents | Interlayer van der Waals (vdW) coupling is generic in two-dimensional materials such as graphene and transition metal dichalcogenides, which can induce very low-energy phonon modes. Using high-resolution inelastic hard x-ray scattering, we uncover the ultra-low energy phonon mode along the Cu-O bond direction in the high-$T_c$ cuprate (Bi,Pb)$_2$(Sr,La)$_2$CuO$_{6+δ}$ (Bi2201). This mode is independent of temperature, while its intensity decreases with doping in accordance with an increasing c-axis lattice parameter. We compare the experimental results to first-principles density functional theory simulations and identify the observed mode as a van der Waals phonon, which arises from the shear motion of the adjacent Bi-O layers. This shows that Bi-based cuprate has similar vibrational properties as graphene and transition metal dichalcogenides, which can be exploited to engineer novel heterostructures. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2106_11523 |
| institution | arXiv |
| publishDate | 2021 |
| record_format | arxiv |
| spellingShingle | Observation of van der Waals phonons in the single-layer cuprate (Bi,Pb)$_2$(Sr,La)$_2$CuO$_{6+δ}$ Peng, Y. Y. Boukahil, I. Krongchon, K. Xiao, Q. Husain, A. A. Lee, Sangjun Li, Q. Z. Alatas, A. Said, A. H. Yan, H. T. Ding, Y. Zhao, L. Zhou, X. J. Devereaux, T. P. Wagner, L. K. Pemmaraju, C. D. Abbamonte, P. Superconductivity Strongly Correlated Electrons Interlayer van der Waals (vdW) coupling is generic in two-dimensional materials such as graphene and transition metal dichalcogenides, which can induce very low-energy phonon modes. Using high-resolution inelastic hard x-ray scattering, we uncover the ultra-low energy phonon mode along the Cu-O bond direction in the high-$T_c$ cuprate (Bi,Pb)$_2$(Sr,La)$_2$CuO$_{6+δ}$ (Bi2201). This mode is independent of temperature, while its intensity decreases with doping in accordance with an increasing c-axis lattice parameter. We compare the experimental results to first-principles density functional theory simulations and identify the observed mode as a van der Waals phonon, which arises from the shear motion of the adjacent Bi-O layers. This shows that Bi-based cuprate has similar vibrational properties as graphene and transition metal dichalcogenides, which can be exploited to engineer novel heterostructures. |
| title | Observation of van der Waals phonons in the single-layer cuprate (Bi,Pb)$_2$(Sr,La)$_2$CuO$_{6+δ}$ |
| topic | Superconductivity Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2106.11523 |