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O: Fachverband Oberflächenphysik

O 32: Electronic structure of surfaces: Spectroscopy, surface states I

O 32.6: Vortrag

Dienstag, 13. März 2018, 15:15–15:30, MA 004

Systematics of electronic and magnetic properties in the transition metal-doped quantum anomalous Hall platform Sb2Te3 — •Johannes Jung1, M. Bode1, P. Sessi1, S. Schatz1, T.R.F. Peixoto1, H. Bentmann1, F. Reinert1, A. Barla2, M.F. Islam3, A. Pertsova4, A. Balastky4, and C. M. Canali31Physikalisches Institut, Universität Würzburg, Am Hubland, Würzburg, Germany — 2Istituto di Struttura della Materia, Trieste, Italy — 3Department of Physics,Linnaeus University, Kalmar, Sweden — 4Nordita, Stockholm University, Sweden

The quantum anomalous Hall effect has been reported to emerge in magnetically doped topological insulators. While its phenomenological description is quite clear, its microscopic origins are far from being completely understood and controlled. Here, we provide a systematic characterization of the most prominent QAHE platform: transition metal-doped Sb2Te3. By combing complementary experimental techniques (STM/STS/resPES/XMCD) with ab-initio theory, we analyze how 3d dopants (V, Cr, Mn, Fe) impact the electronic and magnetic properties. Our results reveal that the fate of the topological surface state strongly depends on the specific character of the 3d impurity. In particular, (i) the single-ion magnetic anisotropy, which controls the magnetic gap opening and its stability, can vary from in-plane to out-of-plane depending on the dopant; (ii) the emergence of impurity resonances close to the Dirac point can give rise to new bands, significantly altering the Sb2Te3 electronic structure. Overall, our results provide general guidelines for the realization of a robust QAHE.

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DPG-Physik > DPG-Verhandlungen > 2018 > Berlin