Magnetic-field-induced topological phase transition in Fe-doped (Bi,Sb)${}_2$Se${}_3$ heterostructures

Abstract

Three-dimensional topological insulators (3D-TIs) possess a specific topological order of electronic bands, resulting in gapless surface states via bulk-edge correspondence. Exotic phenomena have been realized in ferromagnetic TIs, such as the quantum anomalous Hall (QAH) effect with a chiral edge conduction and a quantized value of the Hall resistance $R_{yx}$. Here, we report on the emergence of distinct topological phases in paramagnetic Fe-doped (Bi,Sb)${}_2$Se${}_3$ heterostructures with varying structure architecture, doping, and magnetic and electric fields. Starting from a 3D-TI, a two-dimensional insulator appears at layer thicknesses below a critical value, which turns into an Anderson insulator for Fe concentrations sufficiently large to produce localization by magnetic disorder. With applying a magnetic field, a topological transition from the Anderson insulator to the QAH state occurs, which is driven by the formation of an exchange gap owing to a giant Zeeman splitting and reduced magnetic disorder. Topological phase diagram of (Bi,Sb)${}_2$Se${}_3$ allows exploration of intricate interplay of topological protection, magnetic disorder, and exchange splitting.

arXiv comment31 pages, 4 figures and supplementary 30 pages, 11 figures

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Cited by in corpus (7)

• Realization of the Chern insulator and Axion insulator phases in antiferromagnetic $MnTe$-$B{i}_2(Se,Te{)}_3$-$MnTe$ heterostructures
• Superexchange dominates in magnetic topological insulators
• Quantum anomalous Hall insulator in ionic Rashba lattice of correlated electrons
• Temperature profile of the Thomson-effect-induced heat release/absorption in junctionless single conductors
• Born approximation study of the strong disorder in magnetized surface states of topological insulator
• Impact of correlations on topology in Kane-Mele model decorated with impurities
• Correlated disorder induced anomalous transport in magnetically doped topological insulators