arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1603.04538cond-mat.str-elcond-mat.mtrl-sci
收藏

(111)LaAlO $_3$ / SrTiO $_3$界面上的各向异性多载流子输运

Anisotropic, multi-carrier transport at the (111) LaAlO$_3$/SrTiO$_3$ interface

Samuel Davis, V. Chandrasekhar, Z. Huang, K. Han, Ariando, T. Venkatesan

摘要:

在LaAlO $_3$和SrTiO $_3$之间的界面处形成的导电气体已被证明是各种物理现象的肥沃操场。以前的研究主要集中在(001)和(110)晶体取向上。在这里,我们报告的详细测量(111)LAO/STO界面样品的低温电性能。我们发现,低温电输运性质是高度各向异性的,因为它们沿两个相互正交的晶体取向在界面处显着不同。虽然在一些(001)样品和(110)样品中报告了电阻率的各向异性,但这里报告的(111)样品中的各向异性要强得多,并且还表现在霍尔系数和电容中。此外,各向异性在室温和液氮温度下不存在,而仅在液氦温度及以下存在。暴露于紫外光下会加剧各向异性,这会不成比例地影响沿一个表面晶体方向的传输。此外,低温霍尔系数和电容作为背栅电压的函数的分析表明,除了电子,空穴有助于电输运。

英文摘要:

The conducting gas that forms at the interface between LaAlO$_3$ and SrTiO$_3$ has proven to be a fertile playground for a wide variety of physical phenomena. The bulk of previous research has focused on the (001) and (110) crystal orientations. Here we report detailed measurements of the low-temperature electrical properties of (111) LAO/STO interface samples. We find that the low-temperature electrical transport properties are highly anisotropic, in that they differ significantly along two mutually orthogonal crystal orientations at the interface. While anisotropy in the resistivity has been reported in some (001) samples and in (110) samples, the anisotropy in the (111) samples reported here is much stronger, and also manifests itself in the Hall coefficient as well as the capacitance. In addition, the anisotropy is not present at room temperature and at liquid nitrogen temperatures, but only at liquid helium temperatures and below. The anisotropy is accentuated by exposure to ultraviolet light, which disproportionately affects transport along one surface crystal direction. Furthermore, analysis of the low-temperature Hall coefficient and the capacitance as a function of back gate voltage indicates that in addition to electrons, holes contribute to the electrical transport.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑