Mesoscopic transport in electrostatically-defined spin-full channels in quantum Hall ferromagnets

Abstract

In this work we use electrostatic control of quantum Hall ferromagnetic transitions in CdMnTe quantum wells to study electron transport through individual domain walls (DWs) induced at a specific location. These DWs are formed due to hybridization of two counter-propagating edge states with opposite spin polarization. Conduction through DWs is found to be symmetric under magnetic field direction reversal, consistent with the helical nature of these DWs. We observe that long domain walls are in the insulating regime with localization length 4 - 6~$\mu$m. In shorter DWs the resistance saturates to a non-zero value at low temperatures. Mesoscopic resistance fluctuations in a magnetic field are investigated. The theoretical model of transport through impurity states within the gap induced by spin-orbit interactions agrees well with the experimental data. Helical DWs have required symmetry for the formation of synthetic p-wave superconductors. Achieved electrostatic control of a single helical domain wall is a milestone on the path to their reconfigurable network and ultimately to a demonstration of braiding of non-Abelian excitations.

arXiv comment5 pages and 5 figures in the main text + 5 pages and 9 figures in supplementary materials. New version is revised manuscript according to referees comments. New version doesn't contain any new data

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Cited by in corpus (10)

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• Momentum-resolved spin splitting in Mn-doped trivial CdTe and topological HgTe semiconductors
• Parafermion supporting platform based on spin transitions in the fractional quantum Hall effect regime
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• Parafermions, induced edge states and domain walls in the fractional quantum Hall effect spin transitions
• Disorder-generated non-Abelions
• Spin, orbital and topological order in models of strongly correlated electrons
• Charge and spin textures of Ising quantum Hall ferromagnet domain walls
• Conductance resonances and crossing of the edge channels in the quantum Hall ferromagnet state of Cd(Mn)Te microstructures
• From narrow-gap and semimagnetic semiconductors to spintronics and topological matter: a life with spins