The cyclotron resonance of monolayer graphene, encapsulated in hexagonal boron nitride and with a graphite back-gate, is explored via infrared transmission magnetospectroscopy as a function of the filling factor at fixed magnetic fields. The impact of many-particle interactions in the regime of broken spin and valley symmetries is observed spectroscopically. As the occupancy of the zeroth Landau level is increased from half-filling, a non-monotonic progression of multiple cyclotron resonance peaks is seen for several interband transitions, and reveals the evolution of underlying many-particle-enhanced gaps. Analysis of the peak energies shows significant exchange enhancements of spin gaps both at and below the Fermi energy, a strong filling-factor dependence of the substrate-induced Dirac mass, and also the smallest particle-hole asymmetry reported to date in graphene cyclotron resonance.

中文翻译：

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石墨烯回旋共振中的对称性破裂和Kohn定理

通过固定在磁场下的红外透射电磁波谱研究了单层石墨烯的回旋共振，该回旋共振被封装在六方氮化硼中并带有石墨背栅。用光谱法观察到多颗粒相互作用对自旋和谷对称性破坏的影响。随着从零填充开始增加零阶Landau的占有率，在多个带间跃迁中可以看到多个回旋共振峰的非单调进展，并揭示了潜在的许多粒子增强间隙的演化。对峰值能量的分析表明，在费米能量处和费米能量以下，自旋间隙的交换交换显着增强，这是底物诱导的狄拉克质量与填充因子的强烈依赖关系，