标题： 高载流子密度的SrTiO$_3$基界面中高电子迁移率、未配对自旋和超导性的共存 显示英文标题

标题： Coexistence of high electron-mobility, unpaired spins, and superconductivity at high carrier density SrTiO$_3$-based interfaces

摘要： SrTiO$_3$基二维电子气（2DEGs）的$t_{2g}$带结构，已被发现在超导穹顶、高迁移率输运和自旋-轨道耦合大小等特性中起作用。 这增加了该特定材料平台表现出的多种现象，包括磁性和极端磁阻。 调节和/或结合这些引人入胜的特性可能在量子和自旋电子技术领域取得重大进展。 要做到这一点需要对参数进行精确控制，这需要更好地理解影响这些参数的因素。 在这里，我们介绍了由于在钙钛矿 SrTiO$_3$上生长尖晶石结构的$\gamma$-Al$_2$O$_3$而产生的$t_{2g}$带序反转的影响。 电子输运测量显示，以LaAlO$_3$/SrTiO$_3$作为参考，载流子密度和电子迁移率得到增强，样品表现出超导穹顶的重塑。 此外，随着温度的降低，反常霍尔效应增强，进入与超导转变相同的温度范围，并在面电阻中出现类似科恩多效应的上升。 最后，认为高迁移率的$d_{xz/yz}$-带比$d_{xy}$-带更有可能承载超电流。 显示英文摘要

摘要： The $t_{2g}$ band-structure of SrTiO$_3$-based two-dimensional electron gasses (2DEGs), have been found to play a role in features such as the superconducting dome, high-mobility transport, and the magnitude of spin-orbit coupling. This adds to the already very diverse range of phenomena, including magnetism and extreme magnetoresistance, exhibited by this particular material platform. Tuning and/or combining these intriguing attributes could yield significant progress within quantum and spintronics technologies. Doing so demands precise control of the parameters, which requires a better understanding of the factors that affect them. Here we present effects of the $t_{2g}$ band-order inversion, stemming from the growth of spinel-structured $\gamma$-Al$_2$O$_3$ onto perovskite SrTiO$_3$. Electronic transport measurements show that with LaAlO$_3$/SrTiO$_3$ as the reference, the carrier density and electron mobility are enhanced, and the sample displays a reshaping of the superconducting dome. Additionally, unpaired spins are evidenced by increasing Anomalous Hall Effect with decreasing temperature, entering the same temperature range as the superconducting transition, and a Kondo-like upturn in the sheet resistance. Finally, it is argued that the high-mobility $d_{xz/yz}$-band is more likely than the $d_{xy}$-band to host the supercurrent.