Measurement of the dynamic charge susceptibility near the charge density wave transition in ErTe$_3$
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arXiv
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| Main Authors: | , , , , , , , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866912281039732736 |
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| author | Chaudhuri, Dipanjan Jiang, Qianni Guo, Xuefei Chen, Jin Kengle, Caitlin S. Hoveyda-Marashi, Farzaneh Bernal-Choban, Camille de Vries, Niels Chiang, Tai-Chang Fradkin, Eduardo Fisher, Ian R. Abbamonte, Peter |
| author_facet | Chaudhuri, Dipanjan Jiang, Qianni Guo, Xuefei Chen, Jin Kengle, Caitlin S. Hoveyda-Marashi, Farzaneh Bernal-Choban, Camille de Vries, Niels Chiang, Tai-Chang Fradkin, Eduardo Fisher, Ian R. Abbamonte, Peter |
| contents | A charge density wave (CDW) is a phase of matter characterized by a periodic modulation of the valence electron density accompanied by a distortion of the lattice structure. The microscopic details of CDW formation are closely tied to the dynamic charge susceptibility, $χ(q,ω)$, which describes the behavior of electronic collective modes. Despite decades of extensive study, the behavior of $χ(q,ω)$ in the vicinity of a CDW transition has never been measured with high energy resolution ($\sim$meV). Here, we investigate the canonical CDW transition in ErTe$_3$ using momentum-resolved electron energy loss spectroscopy (M-EELS), a technique uniquely sensitive to valence band charge excitations. Unlike phonons in these materials, which undergo conventional softening due to the Kohn anomaly at the CDW wavevector, the electronic excitations display purely relaxational dynamics that are well described by a diffusive model. The diffusivity peaks around 250 K, just below the critical temperature. Additionally, we report, for the first time, a divergence in the real part of $χ(q,ω)$ in the static limit ($ω\rightarrow 0$), a phenomenon predicted to characterize CDWs since the 1970s. These results highlight the importance of energy- and momentum-resolved measurements of electronic susceptibility and demonstrate the power of M-EELS as a versatile probe of charge dynamics in materials. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2411_14746 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Measurement of the dynamic charge susceptibility near the charge density wave transition in ErTe$_3$ Chaudhuri, Dipanjan Jiang, Qianni Guo, Xuefei Chen, Jin Kengle, Caitlin S. Hoveyda-Marashi, Farzaneh Bernal-Choban, Camille de Vries, Niels Chiang, Tai-Chang Fradkin, Eduardo Fisher, Ian R. Abbamonte, Peter Strongly Correlated Electrons Materials Science A charge density wave (CDW) is a phase of matter characterized by a periodic modulation of the valence electron density accompanied by a distortion of the lattice structure. The microscopic details of CDW formation are closely tied to the dynamic charge susceptibility, $χ(q,ω)$, which describes the behavior of electronic collective modes. Despite decades of extensive study, the behavior of $χ(q,ω)$ in the vicinity of a CDW transition has never been measured with high energy resolution ($\sim$meV). Here, we investigate the canonical CDW transition in ErTe$_3$ using momentum-resolved electron energy loss spectroscopy (M-EELS), a technique uniquely sensitive to valence band charge excitations. Unlike phonons in these materials, which undergo conventional softening due to the Kohn anomaly at the CDW wavevector, the electronic excitations display purely relaxational dynamics that are well described by a diffusive model. The diffusivity peaks around 250 K, just below the critical temperature. Additionally, we report, for the first time, a divergence in the real part of $χ(q,ω)$ in the static limit ($ω\rightarrow 0$), a phenomenon predicted to characterize CDWs since the 1970s. These results highlight the importance of energy- and momentum-resolved measurements of electronic susceptibility and demonstrate the power of M-EELS as a versatile probe of charge dynamics in materials. |
| title | Measurement of the dynamic charge susceptibility near the charge density wave transition in ErTe$_3$ |
| topic | Strongly Correlated Electrons Materials Science |
| url | https://arxiv.org/abs/2411.14746 |