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arXiv 0801.1861cond-mat.mes-hall
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双层石墨烯中的回旋共振

Cyclotron resonance in bilayer graphene

E. A. Henriksen, Z. Jiang, L. -C. Tung, M. E. Schwartz, M. Takita, Y. -J. Wang, P. Kim, H. L. Stormer

摘要:

我们首次测量了双层石墨烯中电子和空穴的回旋共振。在磁场高达B = 18 T,我们观察到四个不同的带内跃迁的导带和价带。跃迁能在最低朗道能级之间的B中大致呈线性,而对于更高的跃迁,它们遵循\sqrt{B}。这种极不寻常的行为代表了从抛物线到线性能量分散的变化。从我们的数据中推导出的态密度与现有的双层石墨烯最低阶紧束缚计算基本一致。然而,在将数据与理论进行比较时,单一的一组拟合参数无法描述实验结果。

英文摘要:

We present the first measurements of cyclotron resonance of electrons and holes in bilayer graphene. In magnetic fields up to B = 18 T we observe four distinct intraband transitions in both the conduction and valence bands. The transition energies are roughly linear in B between the lowest Landau levels, whereas they follow \sqrt{B} for the higher transitions. This highly unusual behavior represents a change from a parabolic to a linear energy dispersion. The density of states derived from our data generally agrees with the existing lowest order tight binding calculation for bilayer graphene. However in comparing data to theory, a single set of fitting parameters fails to describe the experimental results.

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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