Condensed Matter Seminar: "Competing orders out of equilibrium"
(sign-up)Alex Levchenko, University of Wisconsin - Madison
Physics - Condensed Matter
It is known that nonequilibrium conditions can stimulate superconductivity, but what happens if superconducting state competes with another order? We explore this new physics in the context of iron pnictides where competition between spin-density-wave and unconventional superconductivity gives rise to their coexistence in a certain region of the phase diagram controlled by doping. We will discuss two emergent phenomena. First, is dynamic coexistence when magnetic and superconducting orders oscillate with incommensurate frequencies following the sudden perturbation even though the equilibrium thermodynamic state supports only one order parameter. Second, we will show how driven acoustic phonons can induce a nonequilibrium steady state, in which the electronic temperature becomes momentum dependent that in turn changes the interplay of the magnetic and superconducting phases.
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