Suppression of transport spin-polarization of surface states with emergence of ferromagnetism in Mn-doped Bi2 Se3

Journal of Physics. Condensed Matter : an Institute of Physics Journal
Suman KambojGoutam Sheet

Abstract

The surface states of topological insulators (TI) are protected by time reversal symmetry and they display intrinsic spin helicity where the momentum of the charge carriers decides their spin states. As a consequence, a current injected through the surface states becomes spin polarized and this transport spin-polarization leads to a proportionate suppression of Andreev reflection in superconductor/TI junctions. Here we show that upon doping Bi2Se3 with Mn, the transport spin-polarization is seen to be monotonically suppressed. The parent compound Bi2Se3 is found to exhibit a transport spin-polarization of about 63% whereas crystals with 10% Mn doping show transport spin-polarization of about 48%. This suppression is accompanied by an increasing ferromagnetic order of the crystals with Mn doping. Scanning tunneling spectroscopy shows that the topological protection of the surface states reduces due to Mn doping. The net measured transport spin-polarization is due to a competition of this effect with the increased magnetization on Mn doping. The present results provide important insights for the choice of magnetic topological insulators for spintronic applications.

References

Mar 16, 2007·Physical Review Letters·Liang FuE J Mele
Jun 13, 2009·Physical Review Letters·Qin LiuShou-Cheng Zhang
Mar 12, 2010·Nature·Joel E Moore
Sep 28, 2010·Physical Review Letters·Peng ChengQi-Kun Xue
Mar 17, 2011·Physical Review Letters·Jia-Ji ZhuKai Chang
Oct 17, 2015·Journal of Physics. Condensed Matter : an Institute of Physics Journal·A S PanfilovE V Pomjakushina
Mar 24, 2016·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Yuri D GlinkaDavid Lederman

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Citations

Jun 27, 2019·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Suman KambojGoutam Sheet

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