P3 Controlling topological Insulators

The aim of this project is to control topological insulator materials by nonmagnetic and magnetic doping and by interfacing them with ferromagnetic and superconducting films as well as electrically. Of particular interest are the roles of disorder and finite size, mass creation and quantum anomalous Hall effect due to the simultaneous presence of spin-orbit and exchange interactions and the creation of Majorana fermions at the interface with superconductors. Our unique setup at HZB for angle-resolved photoemission spectroscopy (ARPES) combined with spin resolution is the ideal instrumentation to achieve this aim.

National Partners: Saskia Fischer (HU Berlin), Markus Morgenstern (RWTH Aachen)

PhD students in charge: Partha Sarathi Mandal, Peter Hlawenka

Additional support: Andrei Varykhalov



V.V. Volobuev, P.S. Mandal, M. Galicka, O. Caha, J. Sánchez-Barriga, D. Di Sante, A. Varykhalov, A. Khiar, S. Picozzi, G. Bauer, P. Kacman, R. Buczko, O. Rader and G. Springholz, Giant Rashba Splitting in Pb1–xSnxTe (111) Topological Crystalline Insulator Films Controlled by Bi Doping in the Bulk, Adv. Mater. 29, 1604185 (2017)


A. A. Volykhov, J. Sánchez-Barriga, A. P. Sirotina, V.S. Neudachina, A.S. Frolov, E.A. Gerber, E.Yu. Kataev, B.Senkovsky, N.O. Khmelevsky, A.Yu. Aksenenko, N.V. Korobova, A. Knop-Gericke, O. Rader, L.V. Yashina, Rapid Surface Oxidation of Sb2Te3 as Indication for a Universal Trend in the Chemical Reactivity of Tetradymite Topological Insulators, Chem. Mater. 28, 8916 (2016)

J. Sánchez-Barriga, M. G. Vergniory, D. Evtushinsky, I. Aguilera, A. Varykhalov, S. Blügel, O. Rader, Surface Fermi arc connectivity in the type-II Weyl semimetal candidate WTe2, Phys. Rev. B 94, 161401(R) (2016), open access version: arXiv:1608.05633

J. Sánchez-Barriga, E. Golias, A. Varykhalov, J. Braun, L. V. Yashina, R. Schumann, J. Minár, H. Ebert, O. Kornilov, O. Rader, Ultrafast spin-polarization control of Dirac fermions in topological insulators, Phys. Rev. B 93, 155426 (2016), , open access version: arXiv:1505.02742

J. Sánchez-Barriga, A. Varykhalov, G. Springholz, H. Steiner, R. Kirchschlager, G. Bauer, O. Caha, E. Schierle, E. Weschke, A. A. Ünal, S. Valencia, M. Dunst, J. Braun, H. Ebert, J. Minar, E. Golias, L. V. Yashina, A. Ney, V. Holy, O. Rader, Nonmagnetic band gap at the Dirac point of the magnetic topological insulator (Bi1−xMnx)2Se3, Nat. Commun. 7 (2016) 10559, open access version: arXiv:1603.02881

O. Chiatti, C. Riha, D. Lawrenz, M. Busch, S. Dusari, J. Sánchez-Barriga, A. Mogilatenko, L. V. Yashina, S. Valencia, A. A. Ünal, O. Rader, S. F. Fischer, 2D layered transport properties from topological insulator Bi2Se3 single crystals and micro flakes, Sci. Rep. 6, 27483 (2016)


A. Varykhalov, J. Sanchez-Barriga, D. Marchenko, P. Hlawenka, P. S. Mandal, O. Rader, Tunable Fermi level and hedgehog spin texture in gapped graphene, Nat. Commun. 6, 7610 (2015)

M. V. Kuznetsov, L. V. Yashina, J. Sánchez-Barriga, I. I. Ogorodnikov, A. S. Vorokh, A. A. Volykhov, R. J. Koch, V. S. Neudachina, M. E. Tamm, A. P. Sirotina, A. Y. Varykhalov, G. Springholz, G. Bauer, J. D. Riley, O. Rader, Atomic structure of Bi2Se3 and Bi2Te3 (111) surfaces probed by photoelectron diffraction and holography, Phys. Rev. B 91, 085402 (2015)

P. Hlawenka, K. Siemensmeyer, E. Weschke, A. Varykhalov, J. Sánchez-Barriga, N. Y. Shitsevalova, A. V. Dukhnenko, V. B. Filipov, S. Gabáni, K. Flachbart, O. Rader, E. D. L. Rienks, Samarium hexaboride: A trivial surface conductor, arXiv:1502.01542 (2015)


Bendt, G.; Zastrow, S.; Nielsch, K.; Mandal, P. S.; Sanchez-Barriga, J.; Rader, O.; Schulz, S.: Deposition of topological insulator Sb2Te3 films by an MOCVD process,  Journal of Materials Chemistry A 2, 8215 (2014) [open access]

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