We compare and contrast the low temperature magnetotransport properties ofultra-thin, insulating, Be films with and without spin-orbit scattering (SOS).Beryllium films have very little intrinsic SOS, but by "dusting" them withsub-monolayer coverages of Au, one can introduce a well controlled SOS rate.Pure Be films with sheet resistance R >R_Q exhibit a low-temperature negativemagnetoresistance (MR) that saturates to the quantum resistance R_Q = h/e^2.This high-field quantum metal phase is believed to represent a new ground stateof the system. In contrast, the corresponding negative MR in Be/Au films isgreatly diminished, suggesting that, in the presence of strong SOS, the quantummetal phase can only be reached at field scales well beyond those typicallyavailable in a low temperature laboratory.
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机译：我们比较并对比了具有和不具有自旋轨道散射（SOS）的超薄绝缘Be膜的低温磁传输特性。铍膜具有很少的固有SOS，但是通过“粉尘”它们以亚单层覆盖的Au薄膜电阻R> R_Q的纯Be膜表现出的低温负磁阻（MR）会饱和到量子电阻R_Q = h / e ^ 2的水平。代表系统的新基础状态。相反，Be / Au膜中相应的负MR大大降低，这表明，在强SOS的存在下，仅在超出低温实验室通常可用的场尺度下才能达到量子金属相。
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