Simulating dynamically assisted production of Dirac pairs in gapped graphene monolayers
Simulating dynamically assisted production of Dirac pairs in gapped graphene monolayers
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DOI：
10.1103/physrevd.99.016025
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发表时间：
2018-12
影响因子：
5
通讯作者：
Abram Akal;R. Egger;C. Muller;S. Villalba-Ch'avez
中科院分区：
文献类型：
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作者：
Abram Akal;R. Egger;C. Muller;S. Villalba-Ch'avez
在费米表面附近，具有带隙的石墨烯层允许紧密模拟量子电动力学的真空，因此，其尚未验证的强场现象学具有可访问的场强。利用这一显著特征来研究通过模拟生产轻但大质量的狄拉克准粒子对的动态辅助对生产的合理物质化。该过程是在弱高频电场模式和强低频电场随时间振荡的场结构中考虑的。它的理论研究是从量子动力学方法进行的，类似于QED中控制自发产生对的方法。我们证明了弱辅助模式的存在与仅由强场驱动的设置相比，可以显著增加产生的大质量狄拉克对的数量。此外，该工艺的效率与无间隙石墨烯的情况进行了对比，以突出准粒子质量所起的作用。
In a vicinity of the Fermi surface, graphene layers with bandgaps allow for closely simulating the vacuum of quantum electrodynamics and, thus, its yet unverified strong-field phenomenology with accessible field strengths. This striking feature is exploited to investigate a plausible materialization of dynamically assisted pair production through the analog production of light but massive pairs of Dirac quasiparticles. The process is considered in a field configuration combining a weak high-frequency electric mode and a strong low-frequency electric field oscillating in time. Its theoretical study is carried out from a quantum kinetic approach, similar to the one governing the spontaneous production of pairs in QED. We show that the presence of the weak assisting mode can strongly increase the number of produced massive Dirac pairs as compared with a setup driven by the strong field only. The efficiency of the process is contrasted, moreover, with the case of gapless graphene to highlight the role played by the quasiparticle mass.