Magnetic field effect on the slow relaxation of photoconductance in tunnel coupled quantum dot arrays

N. P. Stepina, A. V. Shumilin, A. F. Zinovieva, A. V. Nenashev, A. Yu Gornov, A. V. Dvurechenskii

Research output: Contribution to journalArticlepeer-review

Abstract

The effect of magnetic field on the long-term photoconductance relaxation in two-dimensional arrays of Ge tunnel-coupled quantum dots grown on Si by molecular-beam epitaxy is studied. It was shown that the relaxation process can be slowed down as well as accelerated by magnetic field. The sign of changing the relaxation rate depends on the localization radius and the quantum dot occupancy. To explain an unusual acceleration effect we proposed a model based on the difference in probabilities of carrier transitions to single- or double-occupied quantum dots due to Zeeman effect.

Original languageEnglish
Article number114126
Number of pages5
JournalPhysica E: Low-Dimensional Systems and Nanostructures
Volume121
DOIs
Publication statusPublished - Jul 2020

Keywords

  • NONEQUILIBRIUM TRANSPORT

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