Temperature-Dependent Third Cumulant of Tunneling Noise

Temperature-dependent third cumulant of tunneling noise.

Poisson statistics predicts that the shot noise in a tunnel junction has a temperature independent third cumulant e(2)I, determined solely by the mean current I. Experimental data, however, show a puzzling temperature dependence. We demonstrate theoretically that the third cumulant becomes strongly temperature dependent and may even change sign as a result of feedback from the electromagnetic e...

Temperature dependent gap anisotropy from interlayer tunneling

A recent experiment by Ma and collaborators shows that the gap anisotropy in Bi 2 Sr 2 Ca 1 Cu 2 O 8+x is strongly temperature dependent. In particular , the superconducting gap along the Γ − M direction shows a weaker temperature dependence than the gap along the Γ − X direction which decreases rapidly with temperature. We explain this novel feature as a natural consequence of the interlayer t...

Cooper - Pair Tunneling : Counting Statistics and Frequency - Dependent Current Noise

We discuss the counting statistics and current noise associated with the double Josephson quasiparticle resonance point in a superconducting single electron transistor. The counting statistics are in general phase-dependent, despite the fact that the average current has no dependence on phase. Focusing on parameter regimes where the counting statistics have no phase-dependence, we use a general...

Entanglement, noise, and the cumulant expansion.

We put forward a simpler and improved variation of a recently proposed method to overcome the signal-to-noise problem found in Monte Carlo calculations of the entanglement entropy of interacting fermions. The present method takes advantage of the approximate log-normal distributions that characterize the signal-to-noise properties of other approaches. In addition, we show that a simple rewritin...

Quantum detectors for the third cumulant of current fluctuations