Dimensionality-Driven Photoproduction of Massive Dirac Pairs near Threshold in Gapped Graphene Monolayers.
Dimensionality-Driven Photoproduction of Massive Dirac Pairs near Threshold in Gapped Graphene Monolayers.
复制标题
DOI：
10.1103/physrevlett.124.110403
复制
发表时间：
2019-12
影响因子：
8.6
通讯作者：
A. Golub;R. Egger;C. Müller;S. Villalba-Chávez
中科院分区：
文献类型：
--
作者：
A. Golub;R. Egger;C. Müller;S. Villalba-Chávez
研究了在两个反向传播光波的复合场中，带隙石墨烯单层中准粒子-空穴对的产生。这个过程代表了量子电动力学（QED）真空中通过布雷特-惠勒效应产生电子-正电子对的模拟。然而，我们表明，石墨烯的二维结构导致两种情况之间的一些显着差异。特别是，与量子电动力学的情况相反，它允许非零对生产率在能量阈值时，布雷特-惠勒反应进行非线性吸收的三个光子。
Generation of quasiparticle-hole pairs in gapped graphene monolayers in the combined field of two counterpropagating light waves is studied. The process represents an analog of electron-positron pair production from the vacuum of quantum electrodynamics (QED) by the Breit-Wheeler effect. We show, however, that the two-dimensional structure of graphene causes some striking differences between both scenarios. In particular, contrary to the QED case, it allows for nonzero pair production rates at the energy threshold when the Breit-Wheeler reaction proceeds nonlinearly with absorption of three photons.