We describe a phenomenological model for the conductance feature near 0.7×2e2/h that occurs in quantum point contacts. We focus on the transconductance at finite source-drain bias and contrast our model with the results expected from a single-particle picture. Good agreement is seen in comparing the model with experimental data, taken on ultra-low-disorder GaAs induced electron systems. Although simple, our phenomenology suggests important boundary conditions for an underlying microscopic theory.
@article{arxiv.cond-mat/0601135,
title = {Phenomenology of the 0.7 conductance feature},
author = {D. J. Reilly and Y. Zhang and L. DiCarlo},
journal= {arXiv preprint arXiv:cond-mat/0601135},
year = {2009}
}
Comments
Proceedings of EP2DS-16 (July 2005). Comments welcome. [email protected]