We measure the effective mass in a dilute two-dimensional electron system in (111)-silicon by analyzing temperature dependence of the Shubnikov-de Haas oscillations in the low-temperature limit. A strong enhancement of the effective mass with decreasing electron density is observed. The mass renormalization as a function of the interaction parameter r_s is in good agreement with that reported for (100)-silicon, which shows that the relative mass enhancement is system- and disorder-independent being determined by electron-electron interactions only.
@article{arxiv.0706.3552,
title = {Strongly enhanced effective mass in dilute two-dimensional electron systems: System-independent origin},
author = {A. A. Shashkin and A. A. Kapustin and E. V. Deviatov and V. T. Dolgopolov and Z. D. Kvon},
journal= {arXiv preprint arXiv:0706.3552},
year = {2007}
}