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WANNIER-MOTT EXCITON AND H, RB ATOM IN A DC ELECRIC FIELD: PHOTOIONIZATION, STARK EFFECT

Sergey V. Ambrosov, О. Yu. Khetselius, А. В. Игнатенко, Sergey V. Ambrosov, О. Ю. Хецеліус, Г. В. Ігнатенко, О. Ю. Хецеліус, А. В. Игнатенко

Published Jan 1, 2008• 1 citation
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Abstract

Фотоэлектроника = Photoelectronics / ОНУ имени И. И. Мечникова. - Одесса : Астропринт,2008.

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A numerical calculation of the DC Stark effect for hydrogen and sodium atoms and Wannier-Mott excitons in an external uniform DC electric field is carried out within the operator perturbation theory method. New adequate model for description of the unique especialitites in the photoionization spectra of the hydrogenic atoms is proposed. It is found that the Stark shift for the n=2 state of excitons in the Cu2 O semiconductor (yellow series) at the electric field strength 600 V/cm results in — 3,1 10 -4 eV which agrees well with experimental data of Gross et al. It is indicated also that the analogous unique especialitites may possibly take a place in the Wannier-Mott excitons spectra near the threshold boundary
External-field driven energy-level discretization, such as Landau quantization or Stark localization, is one of the most intriguing phenomena in quantum systems. We investigate the emergence of the Wannier-Stark ladder coming from the particle-hole continuum and the Stark shifts of the exciton levels in one-dimensional Mott insulators under the dc electric field. The discretized peak structure in the optical-conductivity spectra newly appears by applying the dc electric field, and the positions of these peaks can be reproduced from the energy levels of a simple effective model in the strong-coupling regime. Our results not only suggest that Mott insulators can serve as a viable platform for Stark discretization, but also pave the way for investigations of dynamical properties in correlated many-body systems under a dc electric field.