Phononic Helical Nodal Lines with PT Protection in MoB2
| العنوان: | Phononic Helical Nodal Lines with PT Protection in MoB2 |
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| المؤلفون: | Hechang Lei, Zhong Fang, Qi Wang, Jiaqi Lin, Mark Dean, Hongming Weng, Yue Cao, Gilberto Fabbris, Xuerong Liu, Hu Miao, Ayman Said, Tiantian Zhang |
| المصدر: | Physical Review Letters. 123 |
| بيانات النشر: | American Physical Society (APS), 2019. |
| سنة النشر: | 2019 |
| مصطلحات موضوعية: | Materials science, Phonon, Scattering, Spectrum (functional analysis), Structure (category theory), General Physics and Astronomy, Coupling (probability), 01 natural sciences, Symmetry (physics), Quantum mechanics, 0103 physical sciences, 010306 general physics, Degeneracy (mathematics), Realization (systems) |
| الوصف: | While condensed matter systems host both Fermionic and Bosonic quasi-particles, reliably predicting and empirically verifying topological states is only mature for Fermionic electronic structures, leaving topological Bosonic excitations sporadically explored. This is unfortunate, as Bosonic systems such a phonons offer the opportunity to assess spinless band structures where nodal lines can be realized without invoking special additional symetries to protect against spin-orbit coupling. Here we combine first-principles calculations and meV-resolution inelastic x-ray scattering to demonstrate the first realization of parity-time reversal ($\mathcal{PT}$) symmetry protected helical nodal lines in the phonon spectrum of MoB$_{2}$. This structure is unique to phononic systems as the spin-orbit coupling present in electronic systems tends to lift the degeneracy away from high-symmetry locations. Our study establishes a protocol to accurately identify topological Bosonic excitations, opening a new route to explore exotic topological states in crystalline materials. |
| تدمد: | 1079-7114 0031-9007 |
| الوصول الحر: | https://explore.openaire.eu/search/publication?articleId=doi_________::b9dfba780cadd3abe84dc73a73bd9695Test https://doi.org/10.1103/physrevlett.123.245302Test |
| حقوق: | OPEN |
| رقم الانضمام: | edsair.doi...........b9dfba780cadd3abe84dc73a73bd9695 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 10797114 00319007 |
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