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- W4320720384 abstract "Free-space time domain THz spectroscopy accesses electrodynamic responses in a frequency regime ideally matched to interacting condensed matter systems. However, THz spectroscopy is challenging when samples are physically smaller than the diffraction limit of ~0.5 mm, as is typical, for example, in van der Waals materials and heterostructures. Here, we present an on-chip, time-domain THz spectrometer based on semiconducting photoconductive switches with a bandwidth of 200 GHz to 750 GHz. We measure the optical conductivity of a 7.5-$mu$m wide NbN film across the superconducting transition, demonstrating spectroscopic signatures of the superconducting gap in a sample smaller than 2% of the Rayleigh diffraction limit. Our spectrometer features an interchangeable sample architecture, making it ideal for probing superconductivity, magnetism, and charge order in strongly correlated van der Waals materials." @default.
- W4320720384 created "2023-02-15" @default.
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- W4320720384 date "2023-02-10" @default.
- W4320720384 modified "2023-09-23" @default.
- W4320720384 title "On-chip time-domain terahertz spectroscopy of superconducting films below the diffraction limit" @default.
- W4320720384 doi "https://doi.org/10.48550/arxiv.2302.05434" @default.
- W4320720384 hasPublicationYear "2023" @default.
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