We compare and contrast the low-temperature magnetotransport properties of ultrathin, insulating Be films with and without spin-orbit scattering (SOS). Beryllium films have very little intrinsic SOS, but by "dusting" them with submonolayer coverages of Au, one can introduce a well-controlled SOS rate. Pure Be films with sheet resistance R > RQ exhibit a low-temperature negative magnetoresistance (MR) that saturates to the quantum resistance RQ=h/e2. This high-field quantum metal phase is believed to represent a different ground state of the system. In contrast, the corresponding negative MR in Be/Au films is greatly diminished, suggesting that, in the presence of strong SOS, the quantum metal phase can only be reached at field scales well beyond those typically available in a low-temperature laboratory. © 2009 The American Physical Society.
Publication Source (Journal or Book title)
Physical Review B - Condensed Matter and Materials Physics
Xiong, Y., Karki, A., Young, D., & Adams, P. (2009). Spin-orbit scattering and quantum metallicity in ultrathin Be films. Physical Review B - Condensed Matter and Materials Physics, 79 (2) https://doi.org/10.1103/PhysRevB.79.020510