Li Fu, Zhang Qingtian, Chan Kwok Sum
School of Materials and Energy, Guangdong University of Technology, Guangzhou, 510006, Guangdong, People's Republic of China.
Guangdong Provincial Key Laboratory of Information Photonics Technology, Guangdong University of Technology, Guangzhou, 510006, Guangdong, People's Republic of China.
Sci Rep. 2022 Jul 29;12(1):12987. doi: 10.1038/s41598-022-17288-8.
We report a theoretical study of electronic transport properties of α-T lattice nanoribbons in the presence of uniform electric and magnetic fields. Landau levels with an unexcepted fashion are obtained in the system, and unique flat bands are observed due to the crossed electric and magnetic fields. We found that the nondispersive flat band of α-T lattice is distorted and split to many dispersive energy levels when electric and magnetic fields are applied. A double constriction structure of α-T lattice is considered to investigate the quantum transport in the flat band, and novel quantum transport properties are obtained, which shows great differences from conventional Dirac electrons. Our results show that the flat bands of α-T lattice can also contribute to the quantum transport properties and play an important role in the development of novel Dirac electron device.
我们报道了在均匀电场和磁场存在下α-T晶格纳米带电子输运性质的理论研究。在该系统中获得了具有意外形式的朗道能级，并且由于交叉的电场和磁场观察到了独特的平带。我们发现，当施加电场和磁场时，α-T晶格的非色散平带会发生畸变并分裂为许多色散能级。考虑α-T晶格的双收缩结构来研究平带中的量子输运，并获得了新颖的量子输运性质，这与传统狄拉克电子有很大不同。我们的结果表明，α-T晶格的平带也有助于量子输运性质，并在新型狄拉克电子器件的发展中发挥重要作用。
