We report on the unexpected increase in the dephasing lengths of a graphene sheet caused by the deposition of Pd nanoclusters, as demonstrated by weak localization measurements. The dephasing lengths reached saturated values at low temperatures. Theoretical calculations indicate the p-type charge transfer from the Pd clusters, which contributes more carriers. The saturated values of dephasing lengths often depend on both the carrier concentration and mean free path. Although some impurities are increased as revealed by decreased mobilities, the intense charge transfer leads to the improved saturated values and subsequent improved dephasing lengths.
@article{arxiv.1402.3386,
title = {Enhanced quantum coherence in graphene caused by Pd cluster deposition},
author = {Yuyuan Qin and Junhao Han and Guoping Guo and Yongping Du and Zhaoguo Li and You Song and Li Pi and Xuefeng Wang and Xiangang Wan and Min Han and Fengqi Song},
journal= {arXiv preprint arXiv:1402.3386},
year = {2015}
}