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Unconventional Multiband Superconductivity in BulkSrTiO3andLaAlO3/SrTiO3Interfaces
Physical Review Letters ( IF 8.1 ) Pub Date : 2018-09-18 , DOI: 10.1103/physrevlett.121.127002 Thaís V. Trevisan , Michael Schütt , Rafael M. Fernandes
Physical Review Letters ( IF 8.1 ) Pub Date : 2018-09-18 , DOI: 10.1103/physrevlett.121.127002 Thaís V. Trevisan , Michael Schütt , Rafael M. Fernandes
Although discovered many decades ago, superconductivity in doped remains a topic of intense research. Recent experiments revealed that, upon increasing the carrier concentration, multiple bands cross the Fermi level, signaling the onset of Lifshitz transitions. Interestingly, was observed to be suppressed across the Lifshitz transition of oxygen-deficient ; a similar behavior was also observed in gated interfaces. Such a behavior is difficult to explain in the clean theory of two-band superconductivity, as the additional electronic states provided by the second band should enhance . Here, we show that this unexpected behavior can be explained by the strong pair-breaking effect promoted by disorder, which takes place if the interband pairing interaction is subleading and repulsive. A consequence of this scenario is that, upon moving away from the Lifshitz transition, the two-band superconducting state changes from opposite-sign gaps to same-sign gaps.
中文翻译:
SrTiO3和LaAlO3 / SrTiO3界面中的非常规多带超导性
尽管几十年前被发现,但掺杂中的超导性 仍然是一个深入研究的话题。最近的实验表明,在增加载流子浓度后,多个带穿过费米能级,这标志着Lifshitz转变的开始。有趣的是, 观察到在缺氧的Lifshitz过渡过程中被抑制 ; 在门控系统中也观察到了类似的行为接口。这种现象很难用干净的两带超导理论来解释,因为第二个带提供的附加电子态应增强。在这里,我们表明,这种意外行为可以用无序促进的强大的成对打破效应来解释,如果带间配对相互作用是亚引导和排斥的,就会发生这种情况。这种情况的结果是,在离开Lifshitz跃迁后,两带超导状态从相反符号的间隙变为相同符号的间隙。
更新日期:2018-09-19
中文翻译:
SrTiO3和LaAlO3 / SrTiO3界面中的非常规多带超导性
尽管几十年前被发现,但掺杂中的超导性 仍然是一个深入研究的话题。最近的实验表明,在增加载流子浓度后,多个带穿过费米能级,这标志着Lifshitz转变的开始。有趣的是, 观察到在缺氧的Lifshitz过渡过程中被抑制 ; 在门控系统中也观察到了类似的行为接口。这种现象很难用干净的两带超导理论来解释,因为第二个带提供的附加电子态应增强。在这里,我们表明,这种意外行为可以用无序促进的强大的成对打破效应来解释,如果带间配对相互作用是亚引导和排斥的,就会发生这种情况。这种情况的结果是,在离开Lifshitz跃迁后,两带超导状态从相反符号的间隙变为相同符号的间隙。