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arXiv 1409.0255cond-mat.str-elcond-mat.mes-hall
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具有内禀Rashba相互作用的带隙Dirac材料中的朗道能级和磁振荡

Landau levels and magnetic oscillations in gapped Dirac materials with intrinsic Rashba interaction

V. Yu. Tsaran, S. G. Sharapov

摘要:

一个新的低屈曲狄拉克材料家族,包括硅烯,锗烯等,预计将拥有比原始石墨烯更复杂的朗道能级序列。它们的能量取决于,除其他因素外,内在的自旋轨道(SO)和Rashba SO耦合的强度,并可以通过施加电场$E_z$调谐。用解析和数值方法研究了内禀Rashba SO项对朗道能级能量的影响。研究了态密度的量子磁振荡。振荡的具体特征是存在频率与场$E_z$成比例的拍频。当存在Rashba相互作用时,节拍的频率也取决于载流子浓度,从而允许实验确定其强度。

英文摘要:

A new family of the low-buckled Dirac materials which includes silicene, germanene, etc. is expected to possess a more complicated sequence of Landau levels than in pristine graphene. Their energies depend, among other factors, on the strength of the intrinsic spin-orbit (SO) and Rashba SO couplings and can be tuned by an applied electric field $E_z$. We studied the influence of the intrinsic Rashba SO term on the energies of Landau levels using both analytical and numerical methods. The quantum magnetic oscillations of the density of states are also investigated. A specific feature of the oscillations is the presence of the beats with the frequency proportional to the field $E_z$. The frequency of the beats becomes also dependent on the carrier concentration when Rashba interaction is present allowing experimental determination of its strength.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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