Golub A, Egger R, Müller C, Villalba-Chávez S
Institut für Theoretische Physik, Heinrich Heine Universität Düsseldorf, Universitätsstraße 1, 40225 Düsseldorf, Germany.
Phys Rev Lett. 2020 Mar 20;124(11):110403. doi: 10.1103/PhysRevLett.124.110403.
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.
研究了在两个反向传播光波的组合场中，带隙石墨烯单层中准粒子-空穴对的产生。该过程类似于量子电动力学（QED）真空中通过 Breit-Wheeler 效应产生电子-正电子对。然而，我们表明，石墨烯的二维结构导致了这两种情况之间的一些显著差异。特别是，与 QED 情况相反，当 Breit-Wheeler 反应通过吸收三个光子非线性进行时，它允许在能量阈值处有非零的对产生率。
