Academic Journal
Flat-band and diverse quasi-fermions in Pb10(PO4)6O4
العنوان: | Flat-band and diverse quasi-fermions in Pb10(PO4)6O4 |
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المؤلفون: | Qin He, Da-Shuai Ma, Botao Fu, Xiao-Ping Li |
المصدر: | New Journal of Physics, Vol 26, Iss 8, p 083019 (2024) |
بيانات النشر: | IOP Publishing, 2024. |
سنة النشر: | 2024 |
المجموعة: | LCC:Science LCC:Physics |
مصطلحات موضوعية: | flat band, topological semimetal, ferromagnetism, first-principles calculations, Science, Physics, QC1-999 |
الوصف: | Employing a combination of first-principles calculations and low-energy effective models, we present a comprehensive investigation on the electronic structure of Pb _10 (PO _4 ) _6 O _4 , which exhibits remarkable quasi-one-dimensional topological flat-band around the Fermi level. These flat bands predominantly originate from the $p_x/p_y$ orbitals of the oxygen molecules chain at the fully-occupied 4 e Wyckoff positions and thus can be well-captured by a minimal four-band tight-binding model. Furthermore, the abundant crystal symmetry inherent in Pb _10 (PO _4 ) _6 O _4 provides an ideal platform for the emergence of various quasi-fermions characterized by different dispersion, degeneracy, and dimensionality. These include a 0D four-fold degenerate Dirac fermion exhibiting quadratic dispersion, a 1D quadratic/linear nodal-line fermion along symmetric k -paths, a 1D hourglass nodal-line (HNL) fermion associated with the Dirac fermion, and a 2D symmetry-enforced nodal surface located on the k _z = π plane. Moreover, when considering the weak ferromagnetic order, Pb _10 (PO _4 ) _6 O _4 transforms into a rare semi-half-metal, which is characterized by the presence of Dirac fermion and HNL fermion at the Fermi level for a single spin channel exhibiting 100 $\%$ spin polarization. Our findings reveal the rarely coexistence of flat bands, diverse topological semimetal states and ferromagnetism in Pb _10 (PO _4 ) _6 O _4 , which may provide valuable insights for further exploring the intriguing interplay between superconductivity and exotic electronic states. |
نوع الوثيقة: | article |
وصف الملف: | electronic resource |
اللغة: | English |
تدمد: | 1367-2630 |
Relation: | https://doaj.org/toc/1367-2630 |
DOI: | 10.1088/1367-2630/ad6c78 |
URL الوصول: | https://doaj.org/article/cd1ab73ef23d423a98dbd517bb2a9832 |
رقم الانضمام: | edsdoj.1ab73ef23d423a98dbd517bb2a9832 |
قاعدة البيانات: | Directory of Open Access Journals |
تدمد: | 13672630 |
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DOI: | 10.1088/1367-2630/ad6c78 |