We demonstrate tunable transverse rectification in a density-modulated two-dimensional electron gas (2DEG). The density modulation is induced by two surface gates, running in parallel along a narrow stripe of 2DEG. A transverse voltage in the direction of the density modulation is observed, i.e. perpendicular to the applied source-drain voltage. The polarity of the transverse voltage is independent of the polarity of the source-drain voltage, demonstrating rectification in the device. We find that the transverse voltage Uy depends quadratically on the applied source-drain voltage and non-monotonically on the density modulation. The experimental results are discussed in the framework of a diffusion thermopower model.
@article{arxiv.0804.0689,
title = {Transverse rectification in density-modulated two-dimensional electron gases},
author = {A. Ganczarczyk and S. Rojek and A. Quindeau and M. Geller and A. Hucht and C. Notthoff and D. Reuter and A. D. Wieck and J. König and A. Lorke},
journal= {arXiv preprint arXiv:0804.0689},
year = {2012}
}