Highly Efficient Spin-to-Charge Current Conversion in Strained HgTe Surface States Protected by a HgCdTe Layer

Physical Review Letters
P NoëlJ-P Attané

Abstract

We report the observation of spin-to-charge current conversion in strained mercury telluride at room temperature, using spin pumping experiments. We show that a HgCdTe barrier can be used to protect the HgTe from direct contact with the ferromagnet, leading to very high conversion rates, with inverse Edelstein lengths up to 2.0±0.5  nm. The influence of the HgTe layer thickness on the conversion efficiency is found to differ strongly from what is expected in spin Hall effect systems. These measurements, associated with the temperature dependence of the resistivity, suggest that these high conversion rates are due to the spin momentum locking property of HgTe surface states.

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Citations

Jun 21, 2019·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Y M WangQ K Xue
Jan 4, 2020·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Sergey S KrishtopenkoFrédéric Teppe
Feb 1, 2020·Physical Review Letters·T GuilletM Jamet
Nov 18, 2020·ACS Applied Materials & Interfaces·Braj Bhusan SinghSubhankar Bedanta
Sep 10, 2021·Advanced Materials·Luis M Vicente-ArcheManuel Bibes

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