Strong spin-orbit interaction induced by transition metal oxides at the surface of hydrogen-terminated diamond

Kaijian Xing, Daniel L. Creedon, Steve A. Yianni, Golrokh Akhgar, Lei Zhang, Lothar Ley, Jeffrey C. McCallum, Dong Chen Qi, Christopher I. Pakes

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11 Citations (Scopus)


Hydrogen-terminated diamond possesses an intriguing p-type surface conductivity which is induced via thermodynamically driven electron transfer from the diamond surface into surface acceptors such as atmospheric adsorbates, a process called surface transfer doping. High electron affinity transition metal oxides (TMOs) including MoO3 and V2O5 have been shown to be highly effective solid-state surface acceptors for diamond, giving rise to a sub-surface two-dimensional (2D) hole layer with metallic conduction. In this work, low temperature magnetotransport is used as a tool to show the presence of a Rashba-type spin-orbit interaction with a high spin-orbit coupling of 19.9 meV for MoO3 doping and 22.9 meV for V2O5 doping, respectively, through the observation of a transition in the phase-coherent backscattering transport from weak localization to weak antilocalization at low temperature. Surface transfer doping of diamond with TMOs provides a 2D hole system with spin-orbit coupling that is over two times larger than that reported for diamond surfaces with atmospheric acceptors, opening up possibilities to study and engineer spin transport in a carbon material system.

Original languageEnglish
Pages (from-to)244-250
Number of pages7
Publication statusPublished - 30 Aug 2020

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