Hi, I'm freshman in Electrical Engineering. I'm going to do a project on a major challenge in electrical engineering nowadays. I intend to discuss the limit of microelectronics at micro-scale and so the challenge is to go deeper into lower scale, i.e. nano and pico scale (pico-scale is quite too far?!). However, I'm stuck with finding appropriate reference materials, as I'm new in the field. Can someone kindly give me some sources or enlighten me with this issue (in case I misconceive something)? Thank you.