Effect of the Triplet State on the Random Telegraph Signal in Si n-MOSFETs

We report on the static magnetic field dependence of the random telegraph signal (RTS) in a submicrometer silicon n-metal-oxide-semiconductor field-effect transistor. Using intense magnetic fields and ${}^3$He temperatures, we find that the characteristic time ratio changes by 3 orders of magnitude when the field increases from 0 to 12 T. Similar behaviour is found when the static field is either in-plane or perpendicular to the two dimensional electron gas. The experimental data can be explained by considering a model which includes the triplet state of the trapping center and the polarization of the channel electron gas.