Mobilities and scattering times in decoupled graphene monolayers
Mobilities and scattering times in decoupled graphene monolayers
复制标题
DOI：
10.1103/physrevb.81.121403
复制
发表时间：
2010-03-01
影响因子：
3.7
通讯作者：
Haug, R. J.
中科院分区：
文献类型：
--
作者：
Schmidt, H.;Luedtke, T.;Haug, R. J.
折叠的单层石墨烯形成两个分离的单层的系统，所述两个分离的单层仅相距几埃。使用磁输运测量，我们调查的电子性质的两个层进行平行。我们展示了一种方法来获得的个别层的迁移率，尽管他们共同接触。上层的迁移率明显大于底层，表明衬底的影响较弱。这通过顶层中较大的传输和量子散射时间来证实。分析了Shubnikov-de哈斯振荡的温度依赖性，得到了有效质量和相应的费米速度，与单层相比，其值降低了66%。
Folded single-layer graphene forms a system of two decoupled monolayers being only a few angstroms apart. Using magnetotransport measurements we investigate the electronic properties of the two layers conducting in parallel. We show a method to obtain the mobilities for the individual layers despite them being jointly contacted. The mobilities in the upper layer are significantly larger than in the bottom one indicating weaker substrate influence. This is confirmed by larger transport and quantum scattering times in the top layer. Analyzing the temperature dependence of the Shubnikov-de Haas oscillations, effective masses and corresponding Fermi velocities are obtained yielding reduced values down to 66% in comparison to monolayers.