Department of Physics, University of Antwerp, Groenenborgerlaan 171, B-2020 Antwerpen, Belgium.
Phys Rev Lett. 2012 Dec 21;109(25):256602. doi: 10.1103/PhysRevLett.109.256602. Epub 2012 Dec 20.
The spectrum of electron-phonon complexes in monolayer graphene is investigated in the presence of a perpendicular quantizing magnetic field. Despite the small electron-phonon coupling, usual perturbation theory is inapplicable for the calculation of the scattering amplitude near the threshold of optical phonon emission. Our findings, beyond perturbation theory, show that the true spectrum near the phonon-emission threshold is completely governed by new branches, corresponding to bound states of an electron and an optical phonon with a binding energy of the order of αω(0), where α is the electron-phonon coupling and ω(0) the phonon energy.
在存在垂直量子化磁场的情况下，研究了单层石墨烯中电子-声子复合物的光谱。尽管电子-声子耦合很小，但通常的微扰理论不适用于计算光学声子发射阈值附近的散射振幅。我们的研究结果表明，在微扰理论之外，在声子发射阈值附近的真实光谱完全由新的分支控制，这些分支对应于电子和光学声子的束缚态，其束缚能约为αω(0)，其中α是电子-声子耦合，ω(0)是声子能量。
