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The quantum interference between two nonmagnetic impurities is studiednumerically in both the d-wave superconducting (DSC) and the d-density wave(DDW) state. In all calculations we include the tunnelling through excitedstates from the CuO$_2$ planes to the BiO layer probed by the STM tip. Comparedto the single impurity case, a systematic study of the modulations in thetwo-impurity local density of states can distinguish between the DSC or DDWstates. This is important if the origin of the pseudogap phase is caused bypreformed pairs or DDW order. Furthermore, in the DSC state the study of theLDOS around two nonmagnetic impurities provide further tests for the potentialscattering model versus more strongly correlated models.Comment: 6 pages, 6 figure

physical review. b, condensed matter

Two nonmagnetic impurities in the<i>d</i>-wave-superconducting and<i>d</i>-density-wave states of the cuprate superconductors as a probe for the pseudogap

Two nonmagnetic impurities in thed-wave-superconducting andd-density-wave states of the cuprate superconductors as a probe for the pseudogap