Infrared nanospectroscopy and imaging of collective superfluid excitations in anisotropic superconductors

Article

关键词: NEAR-FIELD MICROSCOPY;    C-AXIS;    GRAPHENE PLASMONS;    GRAIN-BOUNDARIES;    CHARGE DYNAMICS;    CUO2 PLANES;    SCATTERING;    LA2-XSRXCUO4;    MODES;    SPECTROSCOPY;   

DOI  :  10.1103/PhysRevB.90.014502

来源: SCIE

【 摘 要 】

We investigate near-field infrared spectroscopy and superfluid polariton imaging experiments on conventional and unconventional superconductors. Our modeling shows that near-field spectroscopy can measure the magnitude of the superconducting energy gap in Bardeen-Cooper-Schrieffer-like superconductors with nanoscale spatial resolution. We demonstrate how the same technique can measure the c-axis plasma frequency, and thus the c-axis superfluid density, of layered unconventional superconductors with a similar spatial resolution. Our modeling also shows that near-field techniques can image superfluid surface mode interference patterns near physical and electronic boundaries. We describe how these images can be used to extract the collective mode dispersion of anisotropic superconductors with subdiffractional spatial resolution.

【 授权许可】

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