This title appears in the Scientific Report :
2016
Please use the identifier:
http://dx.doi.org/10.1103/PhysRevB.94.075137 in citations.
Please use the identifier: http://hdl.handle.net/2128/13269 in citations.
Superparamagnetism-induced mesoscopic electron focusing in topological insulators
Superparamagnetism-induced mesoscopic electron focusing in topological insulators
Recently it has been shown that surface magnetic doping of topological insulators induces backscattering of Dirac states which are usually protected by time-reversal symmetry [Sessi et al., Nat. Commun. 5, 5349 (2014)]. Here we report on quasiparticle interference measurements where, by improved Fer...
Saved in:
Personal Name(s): | Sessi, P. (Corresponding author) |
---|---|
Rüßmann, P. / Bathon, T. / Barla, A. / Kokh, K. A. / Tereshchenko, O. E. / Fauth, K. / Mahatha, S. K. / Valbuena, M. A. / Godey, S. / Glott, F. / Mugarza, A. / Gargiani, P. / Valvidares, M. / Long, N. H. / Carbone, C. / Mavropoulos, P. / Blügel, S. / Bode, M. | |
Contributing Institute: |
Quanten-Theorie der Materialien; IAS-1 JARA - HPC; JARA-HPC JARA-FIT; JARA-FIT Quanten-Theorie der Materialien; PGI-1 |
Published in: | Physical Review B Physical review / B, 94 94 (2016 2016) 7 7, S. 075137 075137 |
Imprint: |
Woodbury, NY
Inst.
2016
|
DOI: |
10.1103/PhysRevB.94.075137 |
Document Type: |
Journal Article |
Research Program: |
Scattering of topologically protected states off defects in topological insulators Controlling Configuration-Based Phenomena Controlling Spin-Based Phenomena |
Link: |
OpenAccess OpenAccess |
Publikationsportal JuSER |
Please use the identifier: http://hdl.handle.net/2128/13269 in citations.
Recently it has been shown that surface magnetic doping of topological insulators induces backscattering of Dirac states which are usually protected by time-reversal symmetry [Sessi et al., Nat. Commun. 5, 5349 (2014)]. Here we report on quasiparticle interference measurements where, by improved Fermi level tuning, strongly focused interference patterns on surface Mn-doped Bi2Te3 could be directly observed by means of scanning tunneling microscopy at 4 K. Ab initio and model calculations reveal that their mesoscopic coherence relies on two prerequisites: (i) a hexagonal Fermi surface with large parallel segments (nesting) and (ii) magnetic dopants which couple to a high-spin state. Indeed, x-ray magnetic circular dichroism shows superparamagnetism even at very dilute Mn concentrations. Our findings provide evidence of strongly anisotropic Dirac-fermion-mediated interactions and demonstrate how spin information can be transmitted over long distances, allowing the design of experiments and devices based on coherent quantum effects in topological insulators. |