Numerical Investigation on Asymmetric Bilayer System at Integer Filling Factor
K. Nomura, D. Yoshioka, T. Jungwirth, and A. H. MacDonald
TL;DR
This paper numerically investigates phase transitions and novel stripe states in asymmetric bilayer systems at various integer filling factors, revealing new magnetic and stripe phases through exact diagonalization and Hartree-Fock calculations.
Contribution
It introduces a detailed numerical analysis of phase transitions and stripe states in asymmetric bilayer systems at integer fillings, highlighting new magnetic and ordered phases.
Findings
Transition from easy-axis to easy-plane ferromagnetism at filling factors 3 and 4
Discovery of a novel vertical stripe state at higher filling factors
Comparison of Hartree-Fock energies for different ordered states
Abstract
Deformation of the easy-axis ferromagnetic state in asymmetric bilayer systems are investigated numerically. Using the exact diagonalization the easy-axis to easy-plane ferromagnetic transition at total filling factor 3 or 4 is investigated. At still higher filling, novel stripe state in which stripes are aligned in the vertical direction occurs. The Hartree-Fock energies of relevant ordered states are calculated and compared.
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