Spin-isospin textured excitations in a double layer at filling factor $\nu =2$

TL;DR

This paper investigates spin-isospin textured excitations in a double-layer quantum Hall system at filling factor 2, revealing new quasiparticles influenced by tunneling and Zeeman effects that could be experimentally observed.

Contribution

It introduces the concept of spin-isospin textures as low-energy excitations in a double layer at filling factor 2, highlighting their dependence on tunneling and Zeeman splittings.

Findings

Low energy excitations are spin-isospin textures with charge localized in one layer.

Increasing tunneling induces a shadow spin texture in the second layer antiferromagnetically coupled.

These quasiparticles exhibit a strong dependence of spin on tunneling and Zeeman couplings.

Abstract

We study the charged excitations of a double layer at filling factor 2 in the ferromagnetic regime. In a wide range of Zeeman and tunneling splittings we find that the low energy charged excitations are spin-isospin textures with the charge mostly located in one of the layers. As tunneling increases, the parent spin texture in one layer becomes larger and it induces, in the other layer, a shadow spin texture antiferromagnetically coupled to the parent texture. These new quasiparticles should be observable by measuring the strong dependence of its spin on tunneling and Zeeman couplings.