Hiromitsu Kato

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The negatively charged nitrogen-vacancy (NV) centre exhibits outstanding optical and spin properties and thus is very attractive for applications in quantum optics. Up to now an active control of the charge state of near-surface NV centres is difficult and the centres switch in an uncontrolled way between different charge states. In this work, we(More)
We fabricated inversion channel diamond metal-oxide-semiconductor field-effect transistors (MOSFETs) with normally off characteristics. At present, Si MOSFETs and insulated gate bipolar transistors (IGBTs) with inversion channels are widely used because of their high controllability of electric power and high tolerance. Although a diamond semiconductor is(More)
Much business and technical attention is being paid to the potential for new services in a ubiquitous computing environment. One of the probable features of these services is 'context-awareness', which is made possible by using information from the physical environmental through sensors. This paper provides an overview of the opportunities for new services(More)
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