Weak localization and weak antilocalization in doped Ge1-ySny layers with up to 8 % Sn

Journal of Physics. Condensed Matter : an Institute of Physics Journal
David WeißhauptJoerg Schulze

Abstract

Low-temperature magnetoresistance measurements of n- and p-doped germanium-tin (Ge1-ySny) layers with Sn concentrations up to 8 % show contributions arising from effects of weak localization for n-type and weak antilocalization for p-type doped samples independent of the Sn concentration. Calculations of the magnetoresistance using the Hikami-Larkin-Nagaoka model for two-dimensional transport allow us to extract the phase-coherence length for all samples as well as the spin-orbit length for the p-type doped samples. For pure Ge, we find phase-coherence lengths as long as (349.0±1.4) nm and (614.0±0.9) nm for n-type and p-type doped samples, respectively. The phase-coherence length decreases with increasing Sn concentration. From the spin-orbit scattering length, we determine the spin-diffusion scattering length in the range of 20-30 nm for all highly degenerate p-type doped samples irrespective of Sn concentration. These results show that Ge1-ySny is a promising material for future spintronic applications.

References

Dec 4, 2014·Journal of Physics. Condensed Matter : an Institute of Physics Journal·J ForondaM Myronov
Mar 19, 2016·Journal of Physics. Condensed Matter : an Institute of Physics Journal·F RortaisM Jamet

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