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arXiv 1506.04743cond-mat.mes-hall
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无磁场的手征等离子体激元

Chiral plasmons without magnetic field

Justin C. W. Song, Mark S. Rudner

摘要:

等离子体激元,相互作用的电子的集体振荡,具有显着改变金属的光学响应的涌现特性。我们预测存在一类新的等离子体-手性Berry等离子体(CBPs)-广泛的二维金属系统,包括带隙狄拉克材料。正如我们所示,在这些材料中的Berry曲率和电子-电子相互作用之间的相互作用产生手性等离子体激元模式在零磁场。CBP模式被限制在系统边界,即使在没有拓扑边缘状态,与手性表现在分裂的能量色散相反方向的等离子体波。我们揭示了丰富的CBP现象学,并提出了实现它们的设置,包括异常霍尔金属和光泵二维狄拉克材料。CBP的实现将为无磁场的亚波长光学非互易性提供一种新的范例,在中IR-THz范围内,具有高达数十THz的可调谐分裂,以及拓扑带的灵敏全光诊断。

英文摘要:

Plasmons, the collective oscillations of interacting electrons, possess emergent properties that dramatically alter the optical response of metals. We predict the existence of a new class of plasmons -- chiral Berry plasmons (CBPs) -- for a wide range of two-dimensional metallic systems including gapped Dirac materials. As we show, in these materials the interplay between Berry curvature and electron-electron interactions yields chiral plasmonic modes at zero magnetic field. The CBP modes are confined to system boundaries, even in the absence of topological edge states, with chirality manifested in split energy dispersions for oppositely directed plasmon waves. We unveil a rich CBP phenomenology and propose setups for realizing them, including in anomalous Hall metals and optically-pumped 2D Dirac materials. Realization of CBPs will offer a new paradigm for magnetic field-free, sub-wavelength optical non-reciprocity, in the mid IR-THz range, with tunable splittings as large as tens of THz, as well as sensitive all-optical diagnostics of topological bands.

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