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arXiv 1807.08347cond-mat.supr-con
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二维超导体-金属相变的密度和无序调谐

The density and disorder tuned superconductor-metal transition in two dimensions

Zhuoyu Chen, Adrian G. Swartz, Hyeok Yoon, Hisashi Inoue, Tyler Merz, Di Lu, Yanwu Xie, Hongtao Yuan, Yasuyuki Hikita, Srinivas Raghu, Harold Y. Hwang

摘要:

在原子控制的氧化物界面处产生的量子基态提供了解决凝聚态物理中的关键问题的机会,包括通常在超导性附近观察到的二维(2D)金属行为的性质。在超导LaAlO 3/SrTiO 3界面处,场效应门控导致超导崩溃,出现金属基态。引人注目的是,这样的金属性伴随着一个伪间隙。在这里,我们利用独立控制的载流子密度和无序的界面超导体使用双静电门,这使得全面检查接近零温度的电子相图。我们发现,赝能隙对应于前体配对,和长程相位相干的发病形成一个二维超导圆顶作为双栅极电压的函数。门调谐超导体-金属跃迁是由约瑟夫森耦合超导熔池的宏观相位起伏驱动的。

英文摘要:

Quantum ground states which arise at atomically controlled oxide interfaces provide an opportunity to address key questions in condensed matter physics, including the nature of two-dimensional (2D) metallic behaviour often observed adjacent to superconductivity. At the superconducting LaAlO3/SrTiO3 interface, a metallic ground state emerges upon the collapse of superconductivity with field-effect gating. Strikingly, such metallicity is accompanied with a pseudogap. Here, we utilize independent control of carrier density and disorder of the interfacial superconductor using dual electrostatic gates, which enables the comprehensive examination of the electronic phase diagram approaching zero temperature. We find that the pseudogap corresponds to precursor pairing, and the onset of long-range phase coherence forms a 2D superconducting dome as a function of the dual gate voltages. The gate-tuned superconductor-metal transitions are driven by macroscopic phase fluctuations of Josephson coupled superconducting puddles.

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