Strong spin-orbit interaction induced by transition metal oxides at the surface of hydrogen-terminated diamond
2020
Xing, Kaijian | Creedon, Daniel L. | Yianni, Steve A. | Akhgar, Golrokh | Zhang, Lei | Ley, Lothar | McCallum, Jeffrey C. | Qi, Dong-Chen | Pakes, Christopher I.
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.
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