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Disordered thin films close to the superconducting-insulating phasetransition (SIT) hold the key to understanding quantum phase transition instrongly correlated materials. The SIT is governed by superconducting quantumfluctuations, which can be revealed for example by tunneling measurements.These experiments detect a spectral gap, accompanied by suppressed coherencepeaks that do not fit the BCS prediction. To explain these observations, weconsider the effect of finite-range superconducting fluctuations on the densityof states, focusing on the insulating side of the SIT. We perform a controlleddiagrammatic resummation and derive analytic expressions for the tunnelingdifferential conductance. We find that short-range superconducting fluctuationssuppress the coherence peaks, even in the presence of long-range correlations.Our approach offers a quantitative description of existing measurements ondisordered thin films and accounts for tunneling spectra with suppressedcoherence peaks observed, for example, in the pseudo gap regime ofhigh-temperature superconductors.

Tunneling probe of fluctuating superconductivity in disordered thin films