论文标题
在石墨烯回旋共振中，断裂的对称性和Kohn的定理
Broken symmetries and Kohn's theorem in graphene cyclotron resonance
论文作者
论文摘要
通过固定磁场处的填充因子的函数，通过红外传输磁光谱探索了六角硼碳封闭的石墨烯的Landau水平过渡的磁磁光谱。由于最低的Landau水平的占用率从半填充而增加，因此观察到多个回旋子共振峰的非单调进展，单个峰变成四个峰，并返回两个峰，所有峰都具有0.5 MEV的线宽。这为电子相互作用与量子厅策略中的破碎自旋和山谷对称性的相互作用提供了一个新颖的窗口。对峰值能量的分析表明，在费米能量下方的自旋差距的间接增强，半填充的狄拉克质量比最低的Landau水平完全充分而大50 \％，并且是一个小但透明的颗粒孔不对称。我们建议，氮化硼在使相互作用增强的对称性中观察到在石墨烯回旋共振中的关键作用。
The magnetoplasmon spectrum of Landau level transitions in hexagonal boron nitride-encapsulated graphene is explored via infrared transmission magnetospectroscopy, as a function of the filling factor at fixed magnetic field. As the lowest Landau level occupancy is increased from half-filling, a non-monotonic progression of multiple cyclotron resonance peaks is observed, with a single peak evolving into four peaks and back to two, all with linewidths of order 0.5 meV. This provides a novel window on the interplay of electron interactions with broken spin and valley symmetries in the quantum Hall regime. Analysis of the peak energies shows an indirect enhancement of spin gaps below the Fermi energy, a Dirac mass at half-filling that is nearly 50\% larger than when the lowest Landau level is completely full, and a small but clear particle-hole asymmetry. We suggest a key role is played by the boron nitride in enabling interaction-enhanced broken symmetries to be observed in graphene cyclotron resonance.
