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Tree-level electron-photon interactions in graphene

机译:石墨烯中的树级电子-光子相互作用

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摘要

Graphene's low-energy electronic excitations obey a 2+1-dimensional Dirac Hamiltonian. After extending this Hamiltonian to include interactions with a quantized electromagnetic field, we calculate the amplitude associated with the simplest, tree-level Feynman diagram: the vertex connecting a photon with two electrons. This amplitude leads to analytic expressions for the three-dimensional angular dependence of photon emission, the photon-mediated electron-hole recombination rate, and corrections to graphene's opacity πα and dynamic conductivity πe~2/2h for situations away from thermal equilibrium, as would occur in a graphene laser. We find that Ohmic dissipation in perfect graphene can be attributed to spontaneous emission.
机译:石墨烯的低能电子激发服从2 + 1维Dirac哈密顿量。在扩展了哈密顿量以包括与量化电磁场的相互作用之后,我们计算出与最简单的树级费曼图有关的振幅:将光子与两个电子相连的顶点。该幅度导致了对光子发射的三维角度依赖性,光子介导的电子-空穴复合速率以及对于远离热平衡的情况的石墨烯不透明度πα和动态电导率πe〜2 / 2h的解析表达式。发生在石墨烯激光器中。我们发现,理想石墨烯中的欧姆耗散可归因于自发发射。

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  • 来源
    《Physical review》 |2010年第24期|P.245401.1-245401.5|共5页
  • 作者单位

    Department of Physics and Astronomy, University of California, Los Angeles, California 90095, USA California NanoSystems Institute, University of California, Los Angeles, California 90095, USA;

    rnCalifornia NanoSystems Institute, University of California, Los Angeles, California 90095, USA Electrical Engineering Department, University of California, Los Angeles, California 90095, USA;

    rnDepartment of Physics and Astronomy, University of California, Los Angeles, California 90095, USA California NanoSystems Institute, University of California, Los Angeles, California 90095, USA;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    fullerenes and related materials; nanotubes;

    机译:富勒烯及相关物质;纳米管;

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