Many-Body Physics and Quantum Chaos

TL;DR

This review explores how concepts from quantum chaos can be applied to understand many-body effects in small, coherent electronic systems, highlighting experimental phenomena like persistent currents and Coulomb blockade.

Contribution

It introduces quantum chaos methods to analyze many-body physics in mesoscopic systems, providing new insights and advantages over traditional approaches.

Findings

Quantum chaos concepts elucidate interference and interaction effects.

Application to persistent currents and Coulomb blockade phenomena.

Highlights advantages of quantum chaos approaches in mesoscopic physics.

Abstract

Experimental progresses in the miniaturisation of electronic devices have made routinely available in the laboratory small electronic systems, on the micron or sub-micron scale, which at low temperature are sufficiently well isolated from their environment to be considered as fully coherent. Some of their most important properties are dominated by the interaction between electrons. Understanding their behaviour therefore requires a description of the interplay between interference effects and interactions. The goal of this review is to address this relatively broad issue, and more specifically to address it from the perspective of the quantum chaos community. I will therefore present some of the concepts developed in the field of quantum chaos which have some application to study many-body effects in mesoscopic and nanoscopic systems. Their implementation is illustrated on a few examples of experimental relevance such as persistent currents, mesoscopic fluctuations of Kondo properties or Coulomb blockade. I will furthermore try to bring out, from the various physical illustrations, some of the specific advantages on more general grounds of the quantum chaos based approach.