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Polaronic signatures and spectral properties of graphene antidot lattices

机译：石墨烯解毒剂点阵的极化特征和光谱性质

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摘要

We explore the consequences of electron-phonon (e-ph) coupling in graphene antidot lattices (graphene nanomeshes), i.e., triangular superlattices of circular holes (antidots) in a graphene sheet. They display a direct band gap whose magnitude can be controlled via the antidot size and density. The relevant coupling mechanism in these semiconducting counterparts of graphene is the modulation of the nearest-neighbor electronic hopping integrals due to lattice distortions (Peierls-type e-ph coupling). We compute the full momentum dependence of the e-ph vertex functions for a number of representative antidot lattices. Based on the latter, we discuss the origins of the previously found large conduction-band quasiparticle spectral weight due to e-ph coupling. In addition, we study the nonzero-momentum quasiparticle properties with the aid of the self-consistent Born approximation, yielding results that can be compared with future angle-resolved photoemission spectroscopy measurements. Our principal finding is a significant e-ph mass enhancement, an indication of polaronic behavior. This can be ascribed to the peculiar momentum dependence of the e-ph interaction in these narrowband systems, which favors small phonon momentum scattering. We also discuss implications of our study for recently fabricated large-period graphene antidot lattices.
机译：我们探索了石墨烯反点晶格（石墨烯纳米网格）中电子-声子（e-ph）耦合的结果，即石墨烯片中圆孔的三角形超晶格（反点）。它们显示出直接的带隙，其大小可以通过解毒剂的大小和密度来控制。在石墨烯的这些半导体对应物中，相关的耦合机制是由于晶格畸变导致的最近邻居电子跳跃积分的调制（Peierls型e-ph耦合）。我们为许多代表性的解毒点阵计算了e-ph顶点函数的全动量依赖性。基于后者，我们讨论了先前发现的由于e-ph耦合而产生的大导带准粒子频谱权重的起源。此外，我们借助自洽的Born近似研究了非零动量准粒子的性质，得出的结果可以与将来的角度分辨光发射光谱测量进行比较。我们的主要发现是e-ph质量的显着提高，表明极化行为。这可以归因于这些窄带系统中e-ph相互作用的特殊动量依赖性，这有利于较小的声子动量散射。我们还讨论了我们的研究对最近制造的大周期石墨烯解毒点阵的影响。

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  • 来源
    《Physical review》 |2010年第16期|p.165410.1-165410.12|共12页
  • 作者

    Vladimir M. Stojanovic; Nenad Vukmirovic; C. Bruder;

  • 作者单位

    Department of Physics, University of Basel, Klingelbergstrasse 82, CH-4056 Basel, Switzerland;

    Computational Research Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA;

    Department of Physics, University of Basel, Klingelbergstrasse 82, CH-4056 Basel, Switzerland;

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  • 正文语种 eng
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  • 关键词

    superlattices;

    机译：超晶格;

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