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arXiv 0908.1238cond-mat.mes-hall
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中性双层石墨烯中的非费米液体行为

Non-Fermi Liquid behavior in Neutral Bilayer Graphene

Yafis Barlas, Kun Yang

摘要:

在随机相位近似(RPA)下,我们计算了未掺杂双层石墨烯的密度-密度响应函数和电子自能。结果表明,准粒子衰变率与准粒子能量成线性关系,准粒子质量在低能极限下近似为零,表明非费米液体行为。这是中性双层石墨烯缺乏费米表面以及相应的可用于散射过程的较大相空间的结果。实验结果,我们的结果,以及他们的差异从单层石墨烯进行了讨论。

英文摘要:

We calculate the density-density response function and electron self-energy for undoped bilayer graphene, within the Random Phase Approximation (RPA). We show that the quasiparticle decay rate scales linearly with the quasiparticle energy, and quasiparticle weight vanishes logarithmically in the low-energy limit, indicating non-Fermi liquid behavior. This is a consequence of the absence of a Fermi surface for neutral bilayer graphene and corresponding larger phase space available for scattering processes. Experimental consequences of our results as well as their differences from those of single-layer graphene are discussed.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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