Journal
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
Volume 216, Issue 8, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/pssa.201800726
Keywords
antimony telluride; bismuth telluride; heterostructure; MBE; rare earth doping; topological insulators
Funding
- John Fell Oxford University Press (OUP) Research Fund
- European Union Seventh Framework Programme [312483]
- DARPA MESO [N66001-11-1-4105]
- Army Research Laboratories
- EPSRC
- ISIS/STFC
- Studienstiftung des deutschen Volkes
- Department of Defense
- VPGE of Stanford University
- Diamond Light Source
- ESRF
- ALBA
- ILL
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Magnetic topological insulators (MTIs) are a novel materials class in which a topologically nontrivial electronic band structure coexists with long-range ferromagnetic order. The ferromagnetic ground state can break time-reversal symmetry, opening a gap in the topological surface states whose size is dependent on the magnitude of the magnetic moment. Doping with rare earth ions is one way to introduce higher magnetic moments into a material, however, in Bi2Te3 bulk crystals, the solubility limit is only a few percent. Using molecular beam epitaxy for the growth of doped (Sb,Bi)(2)(Se,Te)(3) TI thin films, high doping concentrations can be achieved while preserving their high crystalline quality. The growth, structural, electronic, and magnetic properties of Dy, Ho, and Gd doped TI thin films will be reviewed. Indeed, high magnetic moments can be introduced into the TIs, which are, however, not ferromagnetically ordered. By making use of interfacial effects, magnetic long-range order in Dy doped Bi2Te3, proximity-coupled to the MTI Cr:Sb2Te3, has been achieved. Clearly, engineered MTI heterostructures offer new possibilities that combine the advantageous properties of different layers, and thus provide an ideal materials platform enabling the observation new quantum effects at higher temperatures.
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