Cyclotron resonance in bilayer graphene
Cyclotron resonance in bilayer graphene
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DOI：
10.1103/physrevlett.100.087403
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发表时间：
2008-02-29
影响因子：
8.6
通讯作者：
Stormer, H. L.
中科院分区：
文献类型：
--
作者：
Henriksen, E. A.;Jiang, Z.;Stormer, H. L.
我们首次测量了双层石墨烯中电子和空穴的回旋共振。在高达 B=18 T 的磁场中，我们在导带和价带中观察到四个不同的带内跃迁。最低朗道能级之间的跃迁能量在 B 中大致呈线性，而对于更高的跃迁，它们遵循根 B。这种极不寻常的行为代表了从抛物线能量色散到线性能量色散的变化。从我们的数据得出的态密度通常与双层石墨烯现有的最低阶紧束缚计算一致。然而，在将数据与理论进行比较时，一组拟合参数无法描述实验结果。
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 root 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.