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arXiv · 1011.1556

Spin-orbit coupling and phase-coherence in InAs nanowires

S. Estévez Hernández·M. Akabori·K. Sladek·Ch. Volk·S. Alagha·H. Hardtdegen·N. Demarina·D. Grützmacher·Th. Schäpers·M. G. Pala
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Abstract

We investigated the magnetotransport of InAs nanowires grown by selective area metal-organic vapor phase epitaxy. In the temperature range between 0.5 and 30 K reproducible fluctuations in the conductance upon variation of the magnetic field or the back-gate voltage are observed, which are attributed to electron interference effects in small disordered conductors. From the correlation field of the magnetoconductance fluctuations the phase-coherence length l_phi is determined. At the lowest temperatures l_phi is found to be at least 300 nm, while for temperatures exceeding 2 K a monotonous decrease of l_phi with temperature is observed. A direct observation of the weak antilocalization effect indicating the presence of spin-orbit coupling is masked by the strong magnetoconductance fluctuations. However, by averaging the magnetoconductance over a range of gate voltages a clear peak in the magnetoconductance due to the weak antilocalization effect was resolved. By comparison of the experimental data to simulations based on a recursive two-dimensional Green's function approach a spin-orbit scattering length of approximately 70 nm was extracted, indicating the presence of strong spin-orbit coupling.

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S. Estévez Hernández, M. Akabori, K. Sladek, Ch. Volk, S. Alagha, H. Hardtdegen, N. Demarina, D. Grützmacher, Th. Schäpers, M. G. Pala. 2010-11-06. Spin-orbit coupling and phase-coherence in InAs nanowires. https://doi.org/10.1103/physrevb.82.235303

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