Ar辐照SrTiO3中电场调谐的尺寸渡越
Electric Field Tuned Dimensional Crossover in Ar-Irradiated SrTiO3
摘要：
我们提出了在外加静电场下Ar辐照SrTiO 3的低温磁电阻测量。通过背栅偏压施加的电场调制迁移率和片层密度，对前者的影响更大。对于高迁移率，观察到3维轨道磁电阻。对于低迁移率，观察到与抑制2维弱局域化一致的负磁阻。从3到2-维运输的交叉产生的载流子约束，这是增强的电场依赖的介电常数的SrTiO 3的调制。我们的研究结果对氧化物电子器件的发展的影响将被讨论。
英文摘要：
We present low temperature magnetoresistance measurements of Ar-irradiated SrTiO3 under an applied electrostatic field. The electric field, applied through a back gate bias, modulates both the mobility and sheet density, with a greater effect on the former. For high mobilities, 3-dimensional orbital magnetoresistance is observed. For low mobilities, negative magnetoresistance that is consistent with the suppression of 2-dimensional weak-localization is observed. The crossover from 3 to 2-dimensional transport arises from a modulation in the carrier confinement, which is enhanced by the electric field dependent dielectric constant of SrTiO3. The implications of our results on the development of oxide electronic devices will be discussed.
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