Giant nonlocality in nearly compensated 2D semimetals

TL;DR

This paper investigates giant nonlocal charge transport in nearly compensated 2D semimetals under magnetic fields, using a two-fluid model to explain experimental observations and predict future behaviors.

Contribution

It introduces a phenomenological two-fluid framework to describe nonlocal responses in 2D semimetals, specifically applied to graphene, revealing the emergence of giant nonlocality.

Findings

Charge flow profiles evolve under magnetic field.

Giant nonlocal patterns dominate charge transport.

Physical explanation aligns with experimental observations.

Abstract

In compensated two-component systems in confined, two-dimensional geometries, nonlocal response may appear due to external magnetic field. Within a phenomenological two-fluid framework, we demonstrate the evolution of charge flow profiles and the emergence of a giant nonlocal pattern dominating charge transport in magnetic field. Applying our approach to the specific case of intrinsic graphene, we suggest a simple physical explanation for the experimental observation of giant nonlocality. Our results provide an intuitive way to predict the outcome of future experiments exploring the rich physics of many-body electron systems in confined geometries as well as to design possible applications.