Correlated Exciton Transport in Rydberg-Dressed-Atom Spin Chains published in Physical Review Letters August 2015

Transport is an archetypical example of complex non-equilibrium phenomena impacting essentially all areas of physics. This theoretical work was initially motivated by the lack of a good theoretical description of our recent experiments on dipolar energy transport in a gas of atoms optically-coupled to short-lived states acting as a reservoir [related experiments: Günter et al, Science 2013]. We find the nature of transport in this system due to the competition between coherent excitonic motion and special reservoir coupling is much richer than we even anticipated. In addition to coherent and incoherent motion, we find new transport regimes in which an emergent length scale appears and strong exciton-exciton correlations build up indicating excitations in this system hop as pairs. In addition to the immediate applications for introducing and controlling new types of transport in diverse systems (Rydberg atoms, organic semiconductors, quantum dots), we discover this system may also serve as a concrete realisation of recent proposals for entanglement creation through dissipative coupling to engineered reservoirs.

H. Schempp, G. Guenter, S. Wuester, M. Weidemueller and S. Whitlock, Correlated Exciton Transport in Rydberg-Dressed-Atom Spin Chains, Phys. Rev. Lett, 115, 093002 (2015), or see our full list of publications