Correlation-driven quantum geometry effects in a Kondo system

TL;DR

This paper reveals how strong electronic correlations in a Kondo lattice system induce quantum geometric effects, observable through nonlinear transport, and highlights the dynamic origin of quantum geometry beyond static symmetry breaking.

Contribution

It demonstrates correlation-driven quantum geometry in a Kondo system, linking many-body effects to quantum metric and Berry curvature via nonlinear transport measurements.

Findings

Observation of quantum metric quadrupole-induced third-order nonlinear transport in FeTe.

Nonlinear signals follow Kondo lattice crossover and vanish at high temperatures.

Theoretical explanation involving hybridization gap formation at low temperatures.

Abstract

Quantum geometry, including quantum metric and Berry curvature, which describes the topology of electronic states, can induce fascinating physical properties. Symmetry-dependent nonlinear transport has emerged as a sensitive probe of these quantum geometric properties. However, its interplay with strong electronic correlations has rarely been explored in bulk materials, particularly in a Kondo lattice system. Here, we uncover correlation-driven quantum geometry in centrosymmetric antiferromagnetic iron telluride (FeTe). We experimentally observe the quantum metric quadrupole-induced third-order nonlinear transport, whose angular dependence reflects magnetic structure in FeTe. The nonlinear transport signals follow Kondo lattice crossover and vanish at high temperatures. Our theory suggests that a Kondo lattice formed at low temperatures explains the emergence of quantum geometry, which is induced by the opening of a hybridization gap near the Fermi energy. This discovery establishes a paradigm where quantum geometry arises not from static symmetry breaking but from dynamic many-body effects and provides a zero-field probe for sensing antiferromagnetic order.