Dimensional Crossover-Induced Topological Hall Effect in a Magnetic Topological Insulator
Dimensional Crossover-Induced Topological Hall Effect in a Magnetic Topological Insulator
We report transport studies of Mn-doped Bi2Te3 topological insulator (TI) films with accurately controlled thickness grown by molecular beam epitaxy. We find that films thicker than 5 quintuple-layer (QL) exhibit the usual anomalous Hall effect for magnetic TIs. When the thickness is reduced to 4 QL, however, characteristic features associated …