Conductance resonances and crossing of the edge channels in the quantum Hall ferromagnetic state of Cd(Mn)Te microstructures
| Autor: | Jerzy Wróbel, S. Chusnutdinow, E. Bobko, Tomasz Wojtowicz, D. Śnieżek, D. Ploch, Tomasz Wojciechowski, M. Majewicz, M. Foltyn |
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| Rok vydání: | 2019 |
| Předmět: |
Physics
Coupling Condensed Matter - Mesoscale and Nanoscale Physics Spin states Magnetic domain Condensed matter physics FOS: Physical sciences Conductance 02 engineering and technology Landau quantization Quantum Hall effect Condensed Matter::Mesoscopic Systems and Quantum Hall Effect 021001 nanoscience & nanotechnology 01 natural sciences Topological defect Ferromagnetism Mesoscale and Nanoscale Physics (cond-mat.mes-hall) 0103 physical sciences 010306 general physics 0210 nano-technology |
| Zdroj: | Physical Review B. 99 |
| ISSN: | 2469-9969 2469-9950 |
| DOI: | 10.1103/physrevb.99.195446 |
| Popis: | In this paper we report on the observation of very high and narrow magnetoconductance peaks which we attribute to the transition to quantum Hall ferromagnet (QHFM) state occurring at the edges of the sample. We show that the expected spatial degeneracy of chiral edge channels is spontaneously lifted in agreement with theoretical studies performed within the Hartree-Fock approximation. We indicate also that separated edge currents which flow in parallel, may nevertheless cross at certain points, giving rise to the formation of topological defects or one-dimensional magnetic domains. Furthermore, we find that such local crossing of chiral channels can be induced on demand by coupling spin states of a Landau level to different current terminals and applying a DC source-drain voltage. Comment: a detailed discussion of the results has been added |
| Databáze: | OpenAIRE |
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