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Information × Registration Number 0206U004706, 0103U008094 , R & D reports Title Competing interactions and elementary excitations in low-dimensional systems popup.stage_title Head Yeremenko Andrei, Registration Date 14-03-2006 Organization B.Verkin Institute for Low Temperature Physics and Engineering NAS of Ukraine popup.description2 Theoretical and experimental investigations of the model low-dimensional systems and selected samples of materials was carried out in a framework of the competing interactions concept. In particular the optical properties and photoluminescence (normal and ultrafast regimes) of a series of oligoaniline films were studied in a wide temperature range. The analysis of the obtained luminescence and light absorption spectra has revealed intensification of the bi-molecular annihilation of excitons in these semiconducting films. This phenomenon is due to the increase of molecular ordering and of the corresponding efficiency of the energy transfer. The theoretical models of the fundamental physical mechanisms, describing adequately this experimentally observed phenomenon, is suggested in a framework of the general concept of a project. The analysis of nature and hierarchy of competing interactions in the typical low-dimesnsional systems was carried out. These results are giving an opportunity of estimation of acontribution of competing interactions in formation of the elementary excitations (and other quasiparticles) spectra of the selected model systems and real objects. Experimental research was carried out in the wide ranges of frequencies (to infrared those ones) and temperatures (to helium). The obtained results are of important value from the viewpoint of the future applications of the studied and related materials in microphotonics and microelectronics. Product Description popup.authors popup.nrat_date 2020-04-02 Close