| Autor: |
Sai Mu, Kiranmayi D. Dixit, Xiaoping Wang, Douglas L. Abernathy, Huibo Cao, Stephen E. Nagler, Jiaqiang Yan, Paula Lampen-Kelley, David Mandrus, Carlos A. Polanco, Liangbo Liang, Gábor B. Halász, Yongqiang Cheng, Arnab Banerjee, Tom Berlijn |
| Jazyk: |
angličtina |
| Rok vydání: |
2022 |
| Předmět: |
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| Zdroj: |
Physical Review Research, Vol 4, Iss 1, p 013067 (2022) |
| Druh dokumentu: |
article |
| ISSN: |
2643-1564 |
| DOI: |
10.1103/PhysRevResearch.4.013067 |
| Popis: |
Understanding phonons in α-RuCl_{3} is critical to analyze the controversy around the observation of the half-integer thermal quantum Hall effect. While many studies have focused on the magnetic excitations in α-RuCl_{3}, its vibrational excitation spectrum has remained relatively unexplored. We investigate the phonon structure of α-RuCl_{3} via inelastic neutron-scattering experiments and density-functional-theory calculations. Our results show excellent agreement between experiment and first-principles calculations. After validating our theoretical model, we extrapolate the low-energy phonon properties. We find that the phonons in α-RuCl_{3} that either propagate or vibrate in the out-of-plane direction have significantly reduced velocities and therefore have the potential to dominate the observability of the elusive half-integer plateaus in the thermal Hall conductance. In addition, we use low-energy interlayer phonons to resolve the low-temperature stacking structure of our large crystal of α-RuCl_{3}, which we find to be consistent with that of the R3[over ¯] space group, in agreement with neutron diffraction. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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