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Nonactivated transport of ultradilute two-dimensional hole systems in GaAs field-effect transistors: Interaction versus disorder

机译:GaAs场效应晶体管中超稀疏二维空穴系统的非活化传输:相互作用与无序

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摘要

Very strongly interacting high-purity two-dimensional (2D) electron systems at temperatures T → 0 demonstrate certain nonactivated insulating behaviors that are absent in more disordered systems. By measuring in dark the T dependence of the conductivity of ultrahigh-quality 2D holes with charge densities down to 7 × 10~8 cm~(-2), an approximate power-law behavior is identified. Moreover, the exponent exhibits a linearly decreasing density dependence which suggests an interaction-driven nature. Such an electron state is fragile to even a slight increase of disorder, which causes a crossover from nonactivated to activated conduction. The nonactivated conduction may well be a universal interaction-driven signature of an electron state of strongly correlated (semiquantum) liquid.
机译:在温度T→0时,相互作用非常强烈的高纯度二维(2D)电子系统表现出某些无活化的绝缘行为,而这种行为在较无序的系统中不存在。通过在黑暗中测量电荷密度低至7×10〜8 cm〜(-2)的超高质量2D空穴电导率的T依赖性,可以确定近似的幂律行为。而且,该指数表现出线性下降的密度依赖性,这暗示了相互作用驱动的性质。这样的电子状态易碎,甚至无序增加很小,这会导致从未激活的传导到激活的传导的转换。非激活传导很可能是强相关(半量子)液体电子状态的普遍相互作用驱动签名。

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