An analytical expression is derived for the conductance modulation of a ballistic two dimensional Datta-Das Spin Field Effect Transistor (SPINFET) as a function of gate voltage. Using this expression, we show that the recently observed conductance modulation in a two-dimensional SPINFET structure does not match the theoretically expected result very well. This calls into question the claimed demonstration of the SPINFET and underscores the need for further careful investigation.
@article{arxiv.1001.2705,
title = {Analysis of the two dimensional Datta-Das Spin Field Effect Transistor},
author = {S. Bandyopadhyay},
journal= {arXiv preprint arXiv:1001.2705},
year = {2015}
}