GISC, Departamento de Física de Materiales, Universidad Complutense, E-28040 Madrid, Spain.
J Phys Condens Matter. 2013 Aug 21;25(33):335802. doi: 10.1088/0953-8984/25/33/335802. Epub 2013 Jul 24.
We calculate the binding energy of on- and off-center hydrogenic impurities in a parabolic quantum dot subjected to an intense high-frequency laser field. An exactly solvable model that replaces the actual Coulomb interaction with the donor by a non-local separable potential is introduced for calculating the binding energy. The separable potential allows us to solve the problem exactly and all calculations are carried out analytically. The action of the laser irradiation results in dressed Coulomb and confinement potentials. At low laser intensity the binding energy is found to decrease when the impurity is shifted away from the origin. At high laser intensity and strong confinement the opposite behavior is observed. We propose a simple one-dimensional model that explains the observed crossover.
我们计算了处于强高频激光场中的抛物量子点中处于中心和偏离中心的类氢杂质的结合能。为了计算结合能，我们引入了一个可以将施主的实际库仑相互作用替换为非局域可分势的完全可解模型。可分势使我们能够精确求解问题，并且所有计算都是通过解析方法进行的。激光辐照的作用导致了伪装的库仑势和约束势。在低激光强度下，当杂质从原点偏移时，结合能会减小。在高激光强度和强约束下，观察到相反的行为。我们提出了一个简单的一维模型来解释观察到的交叉现象。
