Magnetotransport Study of the Canted Antiferromagnetic Phase in Bilayer $\nu=2$ Quantum Hall State

TL;DR

This study investigates the magnetotransport properties of a bilayer quantum Hall system at filling factor ν=2, revealing the emergence and structure of the canted antiferromagnetic phase through experimental and theoretical analysis.

Contribution

It provides new experimental evidence and theoretical insights into the phase diagram and internal structure of the canted antiferromagnetic phase in bilayer quantum Hall systems.

Findings

Identification of the CAF phase between ferromagnetic and spin-singlet phases

Demonstration of the CAF phase's intrinsic two-region structure

Comparison of experimental data with Hartree-Fock and exact diagonalization calculations

Abstract

Magnetotransport properties are investigated in the bilayer quantum Hall state at the total filling factor $\nu=2$. We measured the activation energy elaborately as a function of the total electron density and the density difference between the two layers. Our experimental data demonstrate clearly the emergence of the canted antiferromagnetic (CAF) phase between the ferromagnetic phase and the spin-singlet phase. The stability of the CAF phase is discussed by the comparison between experimental results and theoretical calculations using a Hartree-Fock approximation and an exact diagonalization study. The data reveal also an intrinsic structure of the CAF phase divided into two regions according to the dominancy between the intralayer and interlayer correlations.