15 September 2020 Tue 10 am

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We propose a method to probe  ground states with distinct properties in binary mixtures trapped in small-ring  lattices. The technique exploits the nonequilibrium particle current behavior  generated  by  a nonadiabatic change of the interaction between the species of the binary mixture. The analysis of the fluctuations of the currents in Fourier space reveals a correspondence between the frequency peaks and specific particle-hole excitations, thereby performing a  many body spectroscopy of the ground state of the system. We show, for a small system, that the read out of the  frequency spectrum can be used to detect essential features of a pair superfluid quantum phase. Remarkably,  large frequency shifts of the spectral peaks provide an indication of relevant differences between ground states located very near in the parameter space. This latter might enable, in experiments where current of particles are present, the detection of ground states with different transport properties.