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Visualizing the unusual spectral weight transfer in DyBa 2 Cu 3 O 7-δ thin film

We report a Spectroscopic Imaging Scanning Tunneling Microscopy (SI-STM) study of a DyBa Cu O (DBCO) thin film (T  ~ 79 K) synthesized by the molecular beam epitaxy (MBE). We observed an unusual transfer of spectral weight in the local density of states (LDOS) spectra occurring only within the super...

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Bibliographic Details
Published in:Scientific reports 2022-01, Vol.12 (1), p.830
Main Authors: Li, Hui, Du, Zengyi, Wu, Ze-Bin, Putzky, Daniel, Joo, Sang Hyun, Kundu, Asish K, Xu, Xiaotao, Shi, Xiaoyan, Lee, Jinho, Pasupathy, Abhay N, Logvenov, Gennady, Keimer, Bernhard, Valla, Tonica, Božović, Ivan, Drozdov, Ilya K, Fujita, Kazuhiro
Format: Article
Language:English
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Summary:We report a Spectroscopic Imaging Scanning Tunneling Microscopy (SI-STM) study of a DyBa Cu O (DBCO) thin film (T  ~ 79 K) synthesized by the molecular beam epitaxy (MBE). We observed an unusual transfer of spectral weight in the local density of states (LDOS) spectra occurring only within the superconducting gap. By a systematic control of the tip-sample distance and the junction resistance, we demonstrate that the spectral weight transfer can be switched at a nano-meter length scale. These results suggest that an interaction between the STM tip and the sample alters the electronic configurations in the film. This probably originates from a combination of an intrinsic band bending at the interface between the surface and the bulk, and a tip-induced band bending. These results may open a new avenue for band engineering and applications of thin films of high-T cuprates.
ISSN:2045-2322