原子氧对SrTiO3（111）上二维电子气的控制
Control of a two-dimensional electron gas on SrTiO3(111) by atomic oxygen
摘要：
我们报道了在（111）取向SrTiO 3的裸露表面上形成二维电子气（2DEG）。角分辨光电子能谱实验揭示了具有6重对称费米面和强各向异性有效质量的高度巡回载流子。的2DEG的电子结构是在良好的协议与自洽的紧束缚超原胞计算，将由于表面能带弯曲的限制电位。我们进一步证明，交替暴露的表面紫外光和原子氧允许调整的载流子密度和完全抑制的2DEG。
英文摘要：
We report on the formation of a two-dimensional electron gas (2DEG) at the bare surface of (111) oriented SrTiO3. Angle resolved photoemission experiments reveal highly itinerant carriers with a 6-fold symmetric Fermi surface and strongly anisotropic effective masses. The electronic structure of the 2DEG is in good agreement with self-consistent tight-binding supercell calculations that incorporate a confinement potential due to surface band bending. We further demonstrate that alternate exposure of the surface to ultraviolet light and atomic oxygen allows tuning of the carrier density and the complete suppression of the 2DEG.
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