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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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Published in: | Scientific reports 2022-01, Vol.12 (1), p.830 |
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Main Authors: | , , , , , , , , , , , , , , , |
Format: | Article |
Language: | English |
Online Access: | Get full text |
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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. |
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ISSN: | 2045-2322 |