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Quasiparticles, plasmarons, and quantum spectral function in bilayer graphene

机译：双层石墨烯中的准粒子，等离激子和量子光谱函数

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摘要

We theoretically study the many-body effects of electron-electron interaction on the single-particle spectral function of doped bilayer graphene (BLG). Using random-phase approximation, we calculate the real and imaginary parts of the self-energy and, hence, the spectral function. The spectral function near the Fermi surface shows the usual quasiparticle (QP) peak, establishing doped BLG, in contrast to the unstable neutral system, to be a Fermi liquid. Away from the Fermi surface, an additional broad plasmaron peak is visible in the spectral function. From the low-energy behavior of the self-energy, we calculate the QP residue and the effective mass of the QPs as a function of carrier density. We present the results for the QP renormalization within the on-shell as well as the off-shell approximations.
机译：我们从理论上研究了电子-电子相互作用对掺杂双层石墨烯（BLG）的单粒子光谱函数的多体效应。使用随机相位逼近，我们可以计算自能量的实部和虚部，从而计算谱函数。费米表面附近的光谱函数显示出通常的准粒子（QP）峰，与不稳定的中性系统相比，建立了掺杂的BLG，成为费米液体。远离费米表面，在光谱函数中可以看到一个额外的宽等离子激元峰。从自能的低能行为，我们计算出QP残留量和QP的有效质量与载流子密度的关系。我们介绍了壳上和壳外近似值中QP重新规范化的结果。

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  • 来源
    《Physical review》 |2011年第4期|p.041408.1-041408.5|共5页
  • 作者

    Rajdeep Sensarma; E. H. Hwang; S. Das Sarma;

  • 作者单位

    Condensed Matter Theory Center, Department of Physics, University of Maryland, College Park, Maryland 20742, USA;

    Condensed Matter Theory Center, Department of Physics, University of Maryland, College Park, Maryland 20742, USA;

    Condensed Matter Theory Center, Department of Physics, University of Maryland, College Park, Maryland 20742, USA;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    fermi surface: calculations and measurements; effective mass, G factor;

    机译：费米表面：计算和测量;有效质量;G因子;

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