量子阈值以上的奇异高次谐波输运
Singular high-harmonic transport above a quantum threshold
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中文总结 AI 辅助
本研究证明小间隙绝缘体中的Landau-Zener隧穿产生奇异直流I-V关系及强高次谐波,谐波响应亚指数衰减,并推导出电流振幅标度律,为THz产生提供新途径。
中文摘要 AI 辅助
我们证明,在小间隙绝缘体中,Landau-Zener隧穿产生奇异的直流电流-电压关系,并相应地,在交流输运中产生强高次谐波。值得注意的是,高次谐波响应随谐波阶数呈亚指数衰减,这比普通导体和PN二极管中的衰减在参数上更慢。我们进一步推导了由基频$\omega$的外加电场$E$产生的频率$n\omega$处电流振幅的标度律。我们的工作为基于固体中频率倍增的THz产生提供了一条有前景的途径。
英文摘要
We show that Landau-Zener tunneling in a small-gap insulator produces a singular DC current--voltage relation, and correspondingly, strong high-harmonic generation in AC transport. Remarkably, high-harmonic responses decrease subexponentially with harmonic order, which is parametrically slower than in ordinary conductors and PN diodes. We further derive a scaling law for the current amplitude at frequency $nω$ produced by the applied electric field $E$ at fundamental frequency $ω$. Our work offers a promising route to THz generation based on frequency multiplication in solids.
发表机构
- Department of Physics, Stanford University(斯坦福大学物理系)
- Department of Physics, Massachusetts Institute of Technology(麻省理工学院物理系)
- Department of Chemistry and Chemical Biology, Harvard University(哈佛大学化学与化学生物学系)
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