Spin and heat transport in one-dimensional quantum magnets

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For one-dimensional quantum spin systems experimental and theoretical studies indicate unexpectedly large, in some cases diverging, spin and heat transport coefficients. This can be the basis of a radically new concept of spin transport – the coherent transport of magnetic information. In the proposed research, pure magnetic excitations like magnons will be used to carry spin information and energy on magnetic lattices. This transport phenomenon is independent of charge motion, which is the prerequisite of usual investigations of spin transport using spin-polarized electron currents. In the proposed work, we want to clarify the relaxation mechanisms and interdependence of spin and heat currents in combined heat transport and magnetic resonance studies. Extending conventional transport and magnetic resonance measurement concepts, we want to develop new techniques for generating pulsed spin and heat currents based on thermal pumping.