Spatial ordering of spatially indirect excitons in the germanium/silicon nanosystems with germanium quantum dots

• It was theoretically predicted that the interaction of spatially indirect excitons possessing dipole moments with the exciting radiation field in the infrared range caused the orientational ordering of the dipole moments of spatially indirect excitons in the germanium quantum dots chains. • It is shown that self-organization of spatially indirect excitons led to the emergence of positive feedback in the response of the nanosystem to an external electric field. • It is shown that spatially indirect excitons were excited not in random directions of their dipole moments, but predominantly with dipole moments directed in such a way that the resulting polarization significantly enhanced the macroscopic electric field of the nanosystem. • It is shown that the macroscopic electric field obtained by optical interrogation, which is extremely enhanced (by almost four orders of magnitude) to B ≈ 10 5 V c m - 1 values, apparently opens the possibility of second harmonic generation in the Ge/Si nanosystem with germanium quantum dots. It is shown that self-organization of spatially indirect excitons in chains of germanium quantum dots leads to the emergence of positive feedback in the response of the nanosystem to an external electric field. As a result, spatially indirect excitons are excited not in random directions of their dipole moments, but predominantly with dipole moments directed in such a way that the resulting polarization significantly enhances the macroscopic electric field of the nanosystem.