Coincidence detection techniques for direct measurement of many-body correlations in strongly correlated electron systems

TL;DR

This paper discusses coincidence detection techniques designed to directly measure many-body correlations in strongly correlated electron systems, promising new insights into complex quantum phenomena.

Contribution

It introduces and explores the potential of coincidence detection methods for directly probing two-body correlations in quantum materials.

Findings

Techniques can measure two-body correlations with momentum, energy, and spatial resolution.

Potential to unravel mechanisms of unconventional superconductivity and quantum spin liquids.

Offers new approaches to study phenomena like itinerant magnetism and electronic nematicity.

Abstract

Research on strongly correlated electron systems faces a fundamental challenge due to the complex nature of intrinsic many-body correlations. A key strategy to address this challenge lies in advancing experimental methods that can directly probe and elucidate the underlying many-body correlations. In this perspective article, we discuss the theoretically proposed coincidence detection techniques, which are designed to directly measure two-body correlations in various particle-particle and particle-hole channels, with momentum, energy, and/or spatial resolution. We also explore the prospects of these coincidence detection techniques for future theoretical and experimental developments. The successful implementation and refinement of these coincidence detection techniques promise to deliver powerful new approaches for unraveling long-standing puzzles in strongly correlated electron systems, such as the enigmatic mechanism of unconventional superconductivity and the long-sought quantum spin liquids. Furthermore, these coincidence detection techniques will offer powerful new methods to investigate novel phenomena like itinerant magnetism and electronic nematicity in quantum materials.