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arXiv 1503.06246physics.opticscond-mat.mes-hall
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利用半导体双曲型超材料实现高质量超大动量态

Realizing high-quality, ultra-large momentum states using semiconductor hyperbolic metamaterials

Salvatore Campione, Sheng Liu, Ting S. Luk, Michael B. Sinclair

摘要:

我们采用有效介质近似(EMA)和布洛赫理论比较半导体双曲型超材料(SHMs)在中红外频率和金属双曲型超材料(MHMs)在可见光频率的色散特性。该分析揭示了EMA可以安全地应用于MHM和SHMs的条件。我们发现,精确的纳米级分层和较长的红外工作波长的组合,使SHMs以及有效的介质限制内,与MHMs相比,允许实现非常高的光子动量状态。此外,SHMs允许新的现象,如超快创建的双曲流形通过光泵。特别是,我们研究了通过光泵浦实现超快拓扑跃迁的可能性,该光泵浦可以在飞秒时间尺度上对适当设计的量子阱进行光掺杂。

英文摘要:

We employ both the effective medium approximation (EMA) and Bloch theory to compare the dispersion properties of semiconductor hyperbolic metamaterials (SHMs) at mid-infrared frequencies and metallic hyperbolic metamaterials (MHMs) at visible frequencies. This analysis reveals the conditions under which the EMA can be safely applied for both MHMs and SHMs. We find that the combination of precise nanoscale layering and the longer infrared operating wavelengths puts the SHMs well within the effective medium limit and, in contrast to MHMs, allows the attainment of very high photon momentum states. In addition, SHMs allow for new phenomena such as ultrafast creation of the hyperbolic manifold through optical pumping. In particular, we examine the possibility of achieving ultrafast topological transitions through optical pumping which can photo-dope appropriately designed quantum wells on the femtosecond time scale.

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