Optically tuned dimensionality crossover in photocarrier-doped SrTiO$_3$: onset of weak localization

Details Optically tuned dimensionality crossover in photocarrier-doped SrTiO$_3$: onset of weak localization Optically tuned dimensionality crossover in photocarrier-doped SrTiO$_3$: onset of weak localization

2007-04-27

arxiv.org/abs/0704.3680v1

Physics

Condensed Matter

Strongly Correlated Electrons

7 pages, 7 figures

Scientific paper

10.1103/PhysRevB.76.085129

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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