The increase in the resistivity with decreasing temperature followed by a drop by more than one order of magnitude is observed on the metallic side near the zero-magnetic-field metal-insulator transition in a strongly interacting two-dimensional electron system in ultra-clean SiGe/Si/SiGe quantum wells. We find that the temperature Tmax, at which the resistivity exhibits a maximum, is close to the renormalized Fermi temperature. However, rather than increasing along with the Fermi temperature, the value Tmax decreases appreciably for spinless electrons in spin-polarizing (parallel) magnetic fields. The observed behaviour of Tmax cannot be described by existing theories. The results indicate the spin-related origin of the effect.
@article{arxiv.2106.05927,
title = {Spin effect on the low-temperature resistivity maximum in a strongly interacting 2D electron system},
author = {A. A. Shashkin and M. Yu. Melnikov and V. T. Dolgopolov and M. M. Radonjić and V. Dobrosavljević and S. -H. Huang and C. W. Liu and Amy Y. X. Zhu and S. V. Kravchenko},
journal= {arXiv preprint arXiv:2106.05927},
year = {2022}
}