论文标题
使用石墨烯量子点在狄拉克海中坠落
Plunging in the Dirac sea using graphene quantum dots
论文作者
论文摘要
数值研究了遭受时间依赖局部场的石墨烯量子点中低能载体的动力学。特别是，我们研究了通过穿越石墨烯样品的离子提供库仑电场的配置。引入了类似Galerkin的数值方案，以求解描述受空间和时间依赖性电磁电位的荷兰式载体，并用于评估场诱导的频带间跃迁。可以证明，随着离子通过石墨烯，电子孔对是通过避免过境的绝热成对创造机制动态生成的，类似于低能重离子碰撞中的电子峰值对产生。
The dynamics of low energy charge carriers in a graphene quantum dot subjected to a time-dependent local field is investigated numerically. In particular, we study a configuration where a Coulomb electric field is provided by an ion traversing the graphene sample. A Galerkin-like numerical scheme is introduced to solve the massless Dirac equation describing charge carriers subjected to space- and time-dependent electromagnetic potentials and is used to evaluate the field induced interband transitions. It is demonstrated that as the ion goes through graphene, electron-hole pairs are generated dynamically via the adiabatic pair creation mechanism around avoided crossings, similar to electron-positron pair generation in low energy heavy ion collisions.
