Finite Size Effect in the Quantum Anomalous Hall system

Abstract

We theoretically investigate the finite size effect in quantum anomalous Hall (QAH) system. Using Mn-doped HgTe quantum well as an example, we demonstrate that the coupling between the edge states is spin dependent, and is related not only to the distance between the edges but also to the doping concentration. Thus, with proper tuning of the two, we can get four kinds of transport regimes: quantum spin Hall regime, QAH regime, edge conducting regime, and normal insulator regime. These transport regimes have distinguishing edge conducting properties while the bulk is insulting. Our results give a general picture of the finite size effect in QAH system, and are important for the transport experiments in QAH nanomaterials as well as future device applications.

arXiv comment5 pages, 4 figures

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Cited by in corpus (3)

• Light-induced phase crossovers in a quantum spin Hall system
• Pure spin current and perfect valley filter by designed separation of the chiral states in two-dimensional honeycomb lattices
• Spin-valley polarized edge states and quantum anomalous Hall states controlled by side potential in 2D honeycomb lattices