排序方式： 共有6条查询结果，搜索用时 11 毫秒
1
1.
Xin-Ke Liu 《中国物理 B》2022,31(12):127203-127203
The search for two-dimensional (2D) nodal ring semimetallic materials is a current research hotspot in spintronics, and designing a 2D nodal ring (NR) material with high Curie temperature ($T_{\mathrm{C}})$ and strong robustness to spin-orbit coupling (SOC) is an even greater challenge. Here, based on the first-principles calculations and symmetry analysis, we predict that 2D Mn$_{2}$N$_{3}$ is a nodal ring semimetal (NRSM) with three energy bands near the Fermi energy level consisting of electrons in the same spin channel. An electron-like energy band and two hole-like energy bands near the Fermi plane cross to form two NRs centered at the point $\varGamma $. Symmetry analysis shows that the spin-polarized NR semimetal is robust to SOC due to the conservation of horizontal mirror symmetry. Monte-Carlo simulations further demonstrate that the $T_{\mathrm{C}}$ of the 2D Mn$_{2}$N$_{3}$ reaches 530 K, well above the room temperature. Notably, the 2D Mn$_{2}$N$_{3}$ remains an NRSM on h-BN substrate. Our results not only reveal a general framework for designing 2D NR materials, but also promote further research in the direction of multifunctional quantum devices for spintronics. 相似文献
2.
3.
4.
[ZnO(0.5 nm)/Co(0.6 nm)]60 multilayers were fabricated by magnetron sputtering. The magnetic, transport and optical properties were studied. The ferromagnetic state at low temperature was demonstrated. Most of the grains in the samples will be unblocked when temperature is below 50K. The measured magneto-resistance at 4.8K is higher than 30%. This value is larger than any other reported data. The transport mechanism may come down to a combination of tunnelling conduction with the second-order hopping. Some small peaks on transmittance curves were found, the matter is still open. 相似文献
5.
Based on the non-equilibrium Green＇s function formalism and first-principles calculations, we investigate the electronic transport properties of an anthracene-based molecular switch with two carbon nanotube electrodes. Our results show that different terminations at the carbon nanotube end strongly affect the transport properties of the switch. In the case of H-termination the current at low biases is dominated by non-resonant tunneling. In the N-termination case the current at low biases is dominated by quasi-resonant tunneling and is increased by several orders of magnitude. The enhancement is discussed by the molecular projected self-consistent Hamiltonian level, transmission function, and local density of states. 相似文献
6.
1