Dirac charge dynamics in graphene by infrared spectroscopy
Dirac charge dynamics in graphene by infrared spectroscopy
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DOI：
10.1038/nphys989
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发表时间：
2008-07-01
期刊：
影响因子：
19.6
通讯作者：
Basov, D. N.
中科院分区：
文献类型：
--
作者：
Li, Z. Q.;Henriksen, E. A.;Basov, D. N.
石墨烯（一种石墨的单原子层）是物质中电子量子特性的一个显著表现。与传统固体中电子用薛定谔方程描述不同，石墨烯中的电子激发由狄拉克哈密顿量（1）控制。石墨烯的一些有趣的电子性质，例如具有线性能量-动量色散的无质量狄拉克准粒子，已经被最近的观察所证实（2-5）。在这里，我们报告了一个红外光谱研究石墨烯的电荷动力学集成在门控器件。我们的测量验证了石墨烯的预期特性，并且由于红外实验先前无法达到的准确性，还发现了准粒子动力学与理想化的独立石墨烯中狄拉克费米子的预测的显着偏离。这里报道的几个观察结果表明，多体相互作用与石墨烯的电磁响应相关。
A remarkable manifestation of the quantum character of electrons in matter is offered by graphene, a single atomic layer of graphite. Unlike conventional solids where electrons are described with the Schrodinger equation, electronic excitations in graphene are governed by the Dirac hamiltonian(1). Some of the intriguing electronic properties of graphene, such as massless Dirac quasiparticles with linear energy - momentum dispersion, have been confirmed by recent observations(2-5). Here, we report an infrared spectromicroscopy study of charge dynamics in graphene integrated in gated devices. Our measurements verify the expected characteristics of graphene and, owing to the previously unattainable accuracy of infrared experiments, also uncover significant departures of the quasiparticle dynamics from predictions made for Dirac fermions in idealized, freestanding graphene. Several observations reported here indicate the relevance of many-body interactions to the electromagnetic response of graphene.