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Complex and nonlinear dynamics of charge and spin structures

Strong Coulomb interactions are essential for collective electronic states in synthetic conductors and superconductors, e.g. in organic (molecular) as well as in transition metal oxides, which are established in the wide temperature range from 250 K down to lowest attainable temperatures. These states, like charge and spin-density waves, charge orderings of various types and orbital orderings, show rich range of nonlinear properties and complex dynamics which connects them with self organized structures of biological makromolecules - biomaterials. Although biological molecular systems function in water environment at around room temperature, the recently developed understanding indicates that Coulomb interactions are so strong that the diversity of phenomena is comparable to the richness of the low-temperature physics. In this lecture, I will describe the conventional spin density wave phase stabilized in the quasi-one-dimensional organic superconductor [1] and the exotic charge density wave phase formed in the spin ladders of quasi-one-dimensional cuprates [2] ; both of them showing complex and nonlinear dynamics in their response to the applied electric fields. At the end I will show how the characterization of complex dynamics displayed by biopolymers, like genomic DNA in aqueous solutions, gives information on their structure and associated biological activity [3]. Publications 1. S.Tomić et al., Phys.Rev.Lett. {;\bf 62}; (1989) 462. ; P.Zornoza et al., Eur. Phys. J. B {;\bf 46};, 223 (2005). 2. T.Vuletić et al., Phys.Rev.Lett. {;\bf 90}; (2003) 257002. and Physics Reports {;\bf 428};, 169 (2006). 6. S. Tomić et al., Phys.Rev.Lett. {;\bf 97}; (2006) 098303. , Phys.Rev.E {;\bf 75}; (2007) 021905 and Europhys. Lett. {;\bf 81};, 68003 (2008).

density waves; superconductivity; strongly correlated systems; reduced dimensionality; self-organized systems; biomaterials

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