硼氢化物倾斜狄拉克锥相的双曲等离子体激元模
Hyperbolic plasmon modes in tilted Dirac cone phases of borophene
摘要：
双曲材料由于能够支持任意高动量的电磁场，因此能够实现非常强的光限制，因此受到了极大的关注。本文基于第一性原理计算和多体微扰理论，研究了单层硼中两个相态（$hr$和$8Pmmn$硼化物）的二维等离激元模的特性及其双曲性质.硼化物的面内各向异性表现在结构、电子、振动和光学性质上。我们发现两个双曲制度的两个阶段的硼，其中高能量的是位于可见光范围内。$hr$ - $sB$硼化物的特征在于固有的高载流子密度，并且其在光谱的可见部分中支持强双曲等离子体模式。另一方面，$8Pmmn$硼化物类似于原型狄拉克材料石墨烯，并且在载流子掺杂时获得中红外的各向异性狄拉克等离子体。我们还研究了电子-声子耦合和朗道阻尼对这些双曲等离子体激元模式的影响。我们的研究结果表明，硼化物，具有高的各向异性，本征高载流子浓度，低损耗的双曲狄拉克等离子体模式，和高限制可以代表一个有前途的候选人低损耗宽带表面等离子体极化激元器件。
英文摘要：
Hyperbolic materials are receiving significant attention due to their ability to support electromagnetic fields with arbitrarily high momenta and, hence, to achieve very strong light confinement. Here, based on first-principles calculations and many-body perturbation theory, we explore the characteristic of two-dimensional plasmon modes and its hyperbolic properties for two phases of single layer boron hosting tilted Dirac cone, namely, the $hr$-$sB$ and $8Pmmn$ borophene. In-plane anisotropy in borophene is manifested in the structural, electronic, vibrational and optical properties. We find two hyperbolic regimes for both phases of borophene, where the high-energy one is located in the visible range. The $hr$-$sB$ borophene is characterised with an intrinsic high carrier density and it supports strong hyperbolic plasmon modes in the visible part of the spectrum. The $8Pmmn$ borophene, on the other hand, resembles the prototypical Dirac material graphene, and upon carrier doping acquires anisotropic Dirac plasmons in the mid-infrared. We have also investigated the impact of the electron-phonon coupling and Landau damping on these hyperbolic plasmon modes. Our results show that borophene, having high anisotropy, intrinsic high carrier concentration, low-loss hyperbolic Dirac plasmon modes, and high confinement can represent a promising candidate for low-loss broad band surface plasmon polariton devices.
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