Berlin 2015 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 103: Transport: Poster Session
TT 103.44: Poster
Thursday, March 19, 2015, 15:00–18:00, Poster B
Quantum Anomalous Hall Effect in the presence of Rashba spin-orbit interaction — •Christoph Kleiner, Jan Boettcher, and Ewelina M. Hankiewicz — Universität Würzburg, Faculty for Physics and Astronomy
We study the quantum anomalous Hall (QAH) effect in Hg1-yMnyTe quantum wells. Here, the QAH effect occurs due to spin splitting in the presence of an intrinsic magnetisation which originates from the manganese atoms [1]. We use an effective four-band model (BHZ) in the tight-binding approximation to study the development of the spin splitting for the edge states and the bulk states. Increasing linearly the energy gap caused by the spin splitting leads to a non-linear behaviour for the bulk bands of one spin direction. Additionally, we observe, that the remaining edge state is shifted into the bulk bands of the opposite spin direction. Since there is no coupling between these two spin blocks in the BHZ model, there are crossings between these bulk bands and the edge states. Furthermore, we study the behaviour of the remaining edge state in the presence of Rashba spin-orbit interaction originating from an inversion breaking potential in the out of plane direction[2] which couples both spin blocks.
[1] Liu et al. PRL 101, 146802(2008).
[2] Rothe et al. New J. Phys. 12, 065012 (2010).