Polarizability, plasmons and damping in pseudospin-1 gapped materials with a flat band.

IF 2.3 4区 物理与天体物理 Q3 PHYSICS, CONDENSED MATTER
Liubov Zhemchuzhna, Andrii Iurov, Godfrey Gumbs, Danhong Huang
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引用次数: 0

Abstract

The subject of our present investigation is the collective electronic properties of various types of pseudospin-1 Dirac-cone materials with a flat band and finite bandgaps in their low-energy spectra. Specifically, we have calculated the dynamical polarization, plasmon dispersions, as well as their decay rates due to Landau damping and presented the closed-form analytical expressions for the wave function overlaps for both the gapped dice lattice and the Lieb lattice. The gapped dice lattice is a special case of the more generalα-T3model such that its band structure is symmetric and the flat band remains dispersionless. On the other hand, the Lieb lattice has a flat band which appears at the lowest point of its conduction band. Our results for these two materials exhibit unique features in the plasmon spectra and their damping regions, which have never been previously reported. For example, the particle-hole modes of a Lieb lattice appear as finite-size regions, while the plasmon modes exist only in areas with small wave numbers but an extended range of frequencies.

平面带赝自旋-1间隙材料的极化率、等离子体激元和阻尼。
本文研究了低能谱中具有平带和有限带隙的各种伪自旋- 1$狄拉克-锥材料的集体电子性质。具体地说,我们计算了动态极化、等离子体色散以及它们在朗道阻尼下的衰减率,并给出了间隙骰子晶格和Lieb晶格的波函数重叠的封闭解析表达式。间隙骰子晶格是更一般的$\alpha$-${\cal T}_3$模型的一种特殊情况,它的能带结构是对称的,并且平坦的能带保持无色散。另一方面,里布晶格的平坦带出现在其导带的最低点。我们的结果表明,这两种材料在等离激元光谱及其阻尼区表现出前所未有的独特特征。例如,里布晶格的粒子-空穴模式表现为有限大小的区域,而等离子体模式只存在于波数小但频率范围扩大的区域。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Journal of Physics: Condensed Matter
Journal of Physics: Condensed Matter 物理-物理:凝聚态物理
CiteScore
5.30
自引率
7.40%
发文量
1288
审稿时长
2.1 months
期刊介绍: Journal of Physics: Condensed Matter covers the whole of condensed matter physics including soft condensed matter and nanostructures. Papers may report experimental, theoretical and simulation studies. Note that papers must contain fundamental condensed matter science: papers reporting methods of materials preparation or properties of materials without novel condensed matter content will not be accepted.
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