Giant Faraday rotation in single- and multilayer graphene
Giant Faraday rotation in single- and multilayer graphene
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DOI：
10.1038/nphys1816
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发表时间：
2011-01-01
期刊：
影响因子：
19.6
通讯作者：
Kuzmenko, Alexey B.
中科院分区：
文献类型：
--
作者：
Crassee, Iris;Levallois, Julien;Kuzmenko, Alexey B.
由法拉第（1）发现的光通过磁场中的介质后的偏振旋转是霍尔效应的光学模拟，它结合了对载流子类型的敏感性和对宽能量范围的访问。到目前为止，显示法拉第旋转的最薄结构是几纳米厚的二维电子气（2）。由于旋转角度与光传播的距离成正比，一个有趣的问题是这种效应在二维原子晶体或薄膜（凝聚态物理学中最薄的物体）中的尺度。在这里，我们证明了一个单一的碳原子层-石墨烯-在适度的磁场中将极化转变几度。这种强烈的旋转是由于共振起源于回旋效应在经典制度和朗道能级间跃迁的量子制度。结合双极掺杂的可能性（3），这开辟了在快速可调谐的近红外磁光器件中使用石墨烯的途径。
The rotation of the polarization of light after passing a medium in a magnetic field, discovered by Faraday(1), is an optical analogue of the Hall effect, which combines sensitivity to the carrier type with access to a broad energy range. Up to now the thinnest structures showing the Faraday rotation were several-nanometre-thick two-dimensional electron gases(2). As the rotation angle is proportional to the distance travelled by the light, an intriguing issue is the scale of this effect in two-dimensional atomic crystals or films-the ultimately thin objects in condensed matter physics. Here we demonstrate that a single atomic layer of carbon-graphene-turns the polarization by several degrees in modest magnetic fields. Such a strong rotation is due to the resonances originating from the cyclotron effect in the classical regime and the inter-Landau-level transitions in the quantum regime. Combined with the possibility of ambipolar doping(3), this opens pathways to use graphene in fast tunable ultrathin infrared magneto-optical devices.