Trigonal warping and anisotropic band splitting in monolayer graphene due to Rashba spin-orbit coupling
Trigonal warping and anisotropic band splitting in monolayer graphene due to Rashba spin-orbit coupling
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DOI：
10.1103/physrevb.82.113405
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发表时间：
2010-05
影响因子：
3.7
通讯作者：
P. Rakyta;A. Kormányos;J. Cserti
中科院分区：
文献类型：
--
作者：
P. Rakyta;A. Kormányos;J. Cserti
研究了存在Rashba自旋轨道耦合时单层石墨烯的电子能带结构。我们发现，如果Rashba自旋-轨道耦合比本然自旋-轨道耦合更强，则低能带会发生三角翘曲变形，并且当能量小于Lifshitz能量时，费米圈会分裂成独立的部分。这种效果与低能量的双层石墨烯非常相似。我们讨论了可能的实验意义，如低电子密度下最小电导率增加三倍，各向异性，波数相关的自旋分裂，以及自旋极化结构。
We study the electronic band structure of monolayer graphene when Rashba spin-orbit coupling is present. We show that if the Rashba spin-orbit coupling is stronger than the intrinsic spin-orbit coupling, the low-energy bands undergo trigonal-warping deformation and that for energies smaller than the Lifshitz energy, the Fermi circle breaks up into separate parts. The effect is very similar to what happens in bilayer graphene at low energies. We discuss the possible experimental implications, such as threefold increase in the minimal conductivity for low electron densities, anisotropic, wave-number-dependent spin splitting of the bands, and the spin-polarization structure.