Anti-correlation for Conductance Fluctuations in Chaotic Quantum Dots

TL;DR

This paper explores how conductance fluctuations in chaotic quantum dots are affected by tunnel barriers and can exhibit anti-correlation, supported by analytical methods and experimental observations.

Contribution

It introduces an analytical stub formalism to analyze conductance fluctuation correlations in chaotic quantum dots with finite tunnel barriers.

Findings

Conductance fluctuations show depletion or amplification depending on tunnel barriers.

Correlation functions can exhibit anti-correlation even in pure Dyson ensembles.

Experimental evidence supports the theoretical predictions.

Abstract

We investigate the correlation functions of mesoscopic electronic transport in open chaotic quantum dots with finite tunnel barriers in the crossover between Wigner-Dyson ensembles. Using an analytical stub formalism, we show the emergence of a depletion/amplification of conductance fluctuations as a function of tunnel barriers, for both parametric variations of electron energy or magnetoconductance fields. Furthermore, even for pure Dyson ensembles, correlation functions of conductance fluctuations in chaotic quantum dots can exhibit anti-correlation. Experimental support to our findings is pointed out.