标题： 超导量子振荡和蜂窝状氧化物界面超导体中的异常负磁阻 显示英文标题

标题： Superconducting quantum oscillations and anomalous negative magnetoresistance in a honeycomb nanopatterned oxide interface superconductor

摘要： 氧化物界面超导体的超流密度极低且具有前所未有的可调性，为研究二维超导体中的涨落提供了一个理想的平台。 在这项工作中，我们制备了一种图案化的 LaAlO₃/KTaO₃ 界面超导体，其绝缘岛呈纳米六边形阵列。 观察到了类似 Little-Parks 的磁阻振荡，这些振荡由超导通量量子 h/2e 决定。 此外，在弱磁场下出现了一种异常负磁阻（ANMR），表明磁场增强了超导性。 通过检查它们对温度、测量电流和电门控的依赖关系，我们得出结论，这两种现象都与超导序参量有关：h/2e 振荡直接证明了库珀对传输的存在；ANMR 被解释为多个连接的狭窄超导路径及其强涨落的结果。 显示英文摘要

摘要： The extremely low superfluid density and unprecedented tunability of oxide interface superconductors provide an ideal platform for studying fluctuations in two-dimensional superconductors. In this work, we have fabricated a LaAlO3/KTaO3 interface superconductor patterned with a nanohoneycomb array of insulating islands. Little-Parks-like magnetoresistance oscillations have been observed, which are dictated by the superconducting flux quantum h/2e. Moreover, an anomalous negative magnetoresistance (ANMR) appears under a weak magnetic field, suggesting magnetic-field-enhanced superconductivity. By examining their dependences on temperature, measurement current, and electrical gating, we conclude that both phenomena are associated with superconducting order parameter: The h/2e oscillations provide direct evidence of Cooper pair transport; the ANMR is interpreted as a consequence of multiple connected narrow superconducting paths with strong fluctuations.