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Visualization of Multifractal Superconductivity in a Two-Dimensional Transition Metal Dichalcogenide in the Weak-Disorder Regime.
Nano Letters ( IF 9.6 ) Pub Date : 2020-05-28 , DOI: 10.1021/acs.nanolett.0c01288 Carmen Rubio-Verdú 1 , Antonio M Garcı A-Garcı A 2 , Hyejin Ryu 3, 4 , Deung-Jang Choi 1, 5, 6, 7 , Javier Zaldı Var 1 , Shujie Tang 3, 8 , Bo Fan 2 , Zhi-Xun Shen 8, 9 , Sung-Kwan Mo 3 , José Ignacio Pascual 1, 7 , Miguel M Ugeda 1, 5, 6, 7
Nano Letters ( IF 9.6 ) Pub Date : 2020-05-28 , DOI: 10.1021/acs.nanolett.0c01288 Carmen Rubio-Verdú 1 , Antonio M Garcı A-Garcı A 2 , Hyejin Ryu 3, 4 , Deung-Jang Choi 1, 5, 6, 7 , Javier Zaldı Var 1 , Shujie Tang 3, 8 , Bo Fan 2 , Zhi-Xun Shen 8, 9 , Sung-Kwan Mo 3 , José Ignacio Pascual 1, 7 , Miguel M Ugeda 1, 5, 6, 7
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Eigenstate multifractality is a distinctive feature of noninteracting disordered metals close to a metal–insulator transition, whose properties are expected to extend to superconductivity. While multifractality in three dimensions (3D) only develops near the critical point for specific strong-disorder strengths, multifractality in 2D systems is expected to be observable even for weak disorder. Here we provide evidence for multifractal features in the superconducting state of an intrinsic, weakly disordered single-layer NbSe2 by means of low-temperature scanning tunneling microscopy/spectroscopy. The superconducting gap, characterized by its width, depth, and coherence peaks’ amplitude, shows a characteristic spatial modulation coincident with the periodicity of the quasiparticle interference pattern. The strong spatial inhomogeneity of the superconducting gap width, proportional to the local order parameter in the weak-disorder regime, follows a log-normal statistical distribution as well as a power-law decay of the two-point correlation function, in agreement with our theoretical model. Furthermore, the experimental singularity spectrum f(α) shows anomalous scaling behavior typical from 2D weakly disordered systems.
中文翻译：
二维无序态过渡金属双硫属化物中的多形超导性可视化。
本征态多重分形是接近金属-绝缘体转变的非相互作用无序金属的显着特征，其特性有望扩展到超导性。虽然三维（3D）的多重分形仅在特定的强无序强度的临界点附近发展，但即使对于弱障碍，也有望在2D系统中观察到多重分形。在这里，我们为固有的弱无序单层NbSe 2的超导状态中的多重分形特征提供了证据通过低温扫描隧道显微镜/光谱学。以其宽度，深度和相干峰幅度为特征的超导间隙显示出与准粒子干涉图样的周期性相一致的特征性空间调制。超导间隙宽度的强空间不均匀性与弱无序状态下的局部有序参数成比例，遵循对数正态统计分布以及两点相关函数的幂律衰减，这与我们的观点一致理论模型。此外，实验奇异谱f（α）显示了2D弱无序系统中常见的异常缩放行为。
更新日期：2020-07-08
中文翻译：
二维无序态过渡金属双硫属化物中的多形超导性可视化。
本征态多重分形是接近金属-绝缘体转变的非相互作用无序金属的显着特征，其特性有望扩展到超导性。虽然三维（3D）的多重分形仅在特定的强无序强度的临界点附近发展，但即使对于弱障碍，也有望在2D系统中观察到多重分形。在这里，我们为固有的弱无序单层NbSe 2的超导状态中的多重分形特征提供了证据通过低温扫描隧道显微镜/光谱学。以其宽度，深度和相干峰幅度为特征的超导间隙显示出与准粒子干涉图样的周期性相一致的特征性空间调制。超导间隙宽度的强空间不均匀性与弱无序状态下的局部有序参数成比例，遵循对数正态统计分布以及两点相关函数的幂律衰减，这与我们的观点一致理论模型。此外，实验奇异谱f（α）显示了2D弱无序系统中常见的异常缩放行为。
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