多层石墨烯/SiC的多组分磁光电导
Multi-component magneto-optical conductivity of multilayer graphene on SiC
摘要：
利用磁光吸收和法拉第旋转测量了SiC C面多层外延石墨烯在磁场高达7 T、温度在5 ~ 300 K范围内的远红外对角电导率和霍尔电导率。在光谱中识别出多个组分，其包括：（i）准经典回旋共振（CR），其源自最接近SiC的高度掺杂的石墨烯层，（ii）低指数朗道能级（LL）之间的跃迁，其源自弱掺杂层，以及（iii）宽的光学吸收背景。电子和空穴型LL跃迁光学区分和共存。在一个石墨烯层内发现约2%的费米速度的电子-空穴不对称性，而费米速度跨层变化约10%。LL跃迁的光强度比没有电子-电子和电子-声子相互作用的孤立石墨烯单层的理论预期小几倍。
英文摘要：
Far-infrared diagonal and Hall conductivities of multilayer epitaxial graphene on the C-face of SiC were measured using magneto-optical absorption and Faraday rotation in magnetic fields up to 7 T and temperatures between 5 and 300 K. Multiple components are identified in the spectra, which include: (i) a quasi-classical cyclotron resonance (CR), originating from the highly doped graphene layer closest to SiC, (ii) transitions between low-index Landau levels (LLs), which stem from weakly doped layers and (iii) a broad optical absorption background. Electron and hole type LL transitions are optically distinguished and shown to coexist. An electron-hole asymmetry of the Fermi velocity of about 2% was found within one graphene layer, while the Fermi velocity varies by about 10% across the layers. The optical intensity of the LL transitions is several times smaller than what is theoretically expected for isolated graphene monolayers without electron-electron and electron-phonon interactions.
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