Engineering of Electron Confinement through Defect‐Based Localized Polarization on SrTiO3 Surface,Advanced Electronic Materials

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Engineering of Electron Confinement through Defect‐Based Localized Polarization on SrTiO3 Surface
Advanced Electronic Materials ( IF 5.3 ) Pub Date : 2021-01-20 , DOI: 10.1002/aelm.202000968
Junyan Chen _{1,

2} , Wei Liu ₁ , Tobias Eul ₂ , Mingjing Chen ₃ , Xiaoyong Hu _{1,

4,

5} , Shufang Wang ₃ , Anquan Jiang ₆ , Hong Yang ₁ , Martin Aeschlimann ₂ , Qihuang Gong _{1,

4,

5}

Affiliation

Electron behaviors are expected to differ in circumstances with polarization. Changes in electron dynamics further result in changes in the physical properties, especially at reduced dimensions. In this paper, threshold photoemission is used to image a 2D electron gas induced on a SrTiO₃ surface with regions polarized by defect‐based localized dipolar moments. It is found that the induction of surface polarization results in decrease of the surface itinerant electron density and the magnetic moments at room temperature. Such effects are attributed to the polarization‐based trapping of the surface itinerant electrons. It is also demonstrated that those changes induced by surface polarization can be manipulated by varying temperature. These findings address the importance of polarization in low‐dimensional electron dynamics, which offers an alternative way to engineer the properties of the SrTiO₃‐based 2D electron gas.

中文翻译：

SrTiO3表面基于缺陷的局部极化的电子约束工程

在极化的情况下，预计电子行为会有所不同。电子动力学的变化进一步导致物理性质的变化，特别是在尺寸减小的情况下。在本文中，阈值光发射用于成像在SrTiO ₃上感应的二维电子气表面具有基于缺陷的局部偶极矩极化的区域。发现表面极化的感应导致在室温下表面流动电子密度和磁矩的降低。这种影响归因于表面流动电子基于极化的俘获。还证明了由表面极化引起的那些变化可以通过改变温度来操纵。这些发现解决了极化在低维电子动力学中的重要性，这为设计基于SrTiO ₃的2D电子气的性质提供了另一种方法。

更新日期：2021-03-11

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