光生载流子掺杂SrTiO $_3$中的光调谐维度交叉：弱局域化的开始
Optically tuned dimensionality crossover in photocarrier-doped SrTiO$_3$: onset of weak localization
摘要：
本文报道了未掺杂的SrTiO $_3$单晶在低于2K的紫外光照射下光生电子的磁输运性质。通过调节光强度，可以控制稳态载流子密度，而调节波长通过调制光穿透深度来控制有效电子厚度。在短波长下，当片电导接近二维Mott最小电导率时，我们观察到弱局域化的临界行为特征。低磁场下的负磁电阻是高度各向异性的，表明准二维电子输运。SrTiO $_3$中光生电子的高迁移率允许通过光激发连续调节有效电子维度。
英文摘要：
We report magnetotransport properties of photogenerated electrons in undoped SrTiO$_3$ single crystals under ultraviolet illumination down to 2 K. By tuning the light intensity, the steady state carrier density can be controlled, while tuning the wavelength controls the effective electronic thickness by modulating the optical penetration depth. At short wavelengths, when the sheet conductance is close to the two-dimensional Mott minimum conductivity we have observed critical behavior characteristic of weak localization. Negative magnetoresistance at low magnetic field is highly anisotropic, indicating quasi-two-dimensional electronic transport. The high mobility of photogenerated electrons in SrTiO$_3$ allows continuous tuning of the effective electronic dimensionality by photoexcitation.
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