论文标题
内在的激发波功能的实验测量
Experimental measurement of the intrinsic excitonic wavefunction
论文作者
论文摘要
激子是由电子和孔形成的两体复合准粒子，是凝结物系统中的基本光学激发。自大约一个世纪前的发现以来，对激发波功能的测量仍然无法实现。在这里，我们通过测量单层WSE2中的激子光合量的电子的动量分布来直接成像相互空间中的激发波功能。通过转换为真实空间，我们可以从激子中获得电子围绕孔周围的电子的分布。此外，还通过解决能量坐标，我们证实了难以捉摸的理论预测，即光电电子的电子表现出反映伴侣孔而不是电子传导循环状态的价带的倒能量摩托孔分散关系。
An exciton, a two-body composite quasiparticle formed of an electron and hole, is a fundamental optical excitation in condensed-matter systems. Since its discovery nearly a century ago, a measurement of the excitonic wavefunction has remained beyond experimental reach. Here, we directly image the excitonic wavefunction in reciprocal space by measuring the momentum distribution of electrons photoemitted from excitons in monolayer WSe2. By transforming to real space, we obtain a visual of the distribution of the electron around the hole in an exciton. Further, by also resolving the energy coordinate, we confirm the elusive theoretical prediction that the photoemitted electron exhibits an inverted energy-momentum dispersion relationship reflecting the valence band where the partner hole remains, rather than that of conduction-band states of the electron.
