تقرير
Two-dimensional nodal-loop half metal in monolayer MnN
| العنوان: | Two-dimensional nodal-loop half metal in monolayer MnN |
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| المؤلفون: | Wang, Shan-Shan, Yu, Zhi-Ming, Liu, Ying, Jiao, Yalong, Guan, Shan, Sheng, Xian-Lei, Yang, Shengyuan A. |
| المصدر: | Phys. Rev. Materials 3, 084201 (2019) |
| سنة النشر: | 2019 |
| المجموعة: | Condensed Matter |
| مصطلحات موضوعية: | Condensed Matter - Mesoscale and Nanoscale Physics |
| الوصف: | Two-dimensional (2D) materials with nodal-loop band crossing have been attracting great research interest. However, it remains a challenge to find 2D nodal loops that are robust against spin-orbit coupling (SOC) and realized in magnetic states. Here, based on first-principles calculations and theoretical analysis, we predict that monolayer MnN is a 2D nodal-loop half metal with fully spin polarized nodal loops. We show that monolayer MnN has a ferromagnetic ground state with out-of-plane magnetization. Its band structure shows half metallicity with three low-energy bands belonging to the same spin channel. The crossing between these bands forms two concentric nodal loops centered around the $\Gamma$ point near the Fermi level. Remarkably, the nodal loops and their spin polarization are robust under SOC, due to the protection of a mirror symmetry. We construct an effective model to characterize the fully polarized emergent nodal-loop fermions. We also find that a uniaxial strain can induce a loop transformation from a localized single loop circling around $\Gamma$ to a pair of extended loops penetrating the Brillouin zone. Comment: 7 pages, 5 fgures |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1103/PhysRevMaterials.3.084201 |
| الوصول الحر: | http://arxiv.org/abs/1903.04705Test |
| رقم الانضمام: | edsarx.1903.04705 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1103/PhysRevMaterials.3.084201 |
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