arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1902.00780cond-mat.mes-hall
收藏

修正的Halfton模型中的可调谐圆二色性和谷偏振

Tunable Circular Dichroism and Valley Polarization in the Modified Haldane Model

Marc Vila, Nguyen Tuan Hung, Stephan Roche, Riichiro Saito

摘要:

我们研究的偏振依赖性的光吸收的修改后的Halfton模型,表现出反手性的边缘模式中存在的样品边界,并已被认为是可实现的过渡金属dichalcogenides或Weyl半金属。揭示了一个丰富的光学相图,其中完美的圆二色性,赝自旋和谷偏振之间的相关性可以独立地调整后的费米能量。重要的是,完美的圆二色性和谷偏振同时实现。这种前所未有的光学特性组合提出了一些有趣的新型光子器件功能(例如光偏振器),这些功能可以与谷电子应用(例如谷电流的产生)相结合。

英文摘要:

We study the polarization dependence of optical absorption for the modified Haldane model, which exhibits antichiral edge modes in presence of sample boundaries and has been argued to be realizable in transition metal dichalcogenides or Weyl semimetals. A rich optical phase diagram is unveiled, in which the correlations between perfect circular dichroism, pseudospin and valley polarization can be tuned independently upon varying the Fermi energy. Importantly, perfect circular dichroism and valley polarization are achieved simultaneously. This unprecedented combination of optical properties suggests some interesting novel photonic device functionality (e.g. light polarizer) which could be combined with valleytronics applications (e.g. generation of valley currents).

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。

↑