Spin鈥揙rbit Interaction in a Two-Dimensional Hole Gas at the Surface of Hydrogenated Diamond
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- 作者：Mark T. Edmonds ; Laurens H. Willems van Beveren ; Oleh Klochan ; Jiri Cervenka ; Kumar Ganesan ; Steven Prawer ; Lothar Ley ; Alexander R. Hamilton ; Christopher I. Pakes
- 刊名：Nano Letters
- 出版年：2015
- 出版时间：January 14, 2015
- 年：2015
- 卷：15
- 期：1
- 页码：16-20
- 全文大小：288K
- ISSN：1530-6992
文摘
Hydrogenated diamond possesses a unique surface conductivity as a result of transfer doping by surface acceptors. Yet, despite being extensively studied for the past two decades, little is known about the system at low temperature, particularly whether a two-dimensional hole gas forms at the diamond surface. Here we report that (100) diamond, when functionalized with hydrogen, supports a p-type spin-3/2 two-dimensional surface conductivity with a spin鈥搊rbit interaction of 9.74 卤 0.1 meV through the observation of weak antilocalization effects in magneto-conductivity measurements at low temperature. Fits to 2D localization theory yield a spin relaxation length of 30 卤 1 nm and a spin-relaxation time of 鈭?.67 卤 0.02 ps. The existence of a 2D system with spin orbit coupling at the surface of a wide band gap insulating material has great potential for future applications in ferromagnet鈥搒emiconductor and superconductor鈥搒emiconductor devices.