Atomic-scale observation of localized phonons at FeSe/SrTiO3 interface

Ruochen Shi, Qize Li, Xiaofeng Xu, Bo Han, Ruixue Zhu, Fachen Liu, Ruishi Qi, Xiaowen Zhang, Jinlong Du, Ji Chen, Dapeng Yu, Xuetao Zhu (), Jiandong Guo () and Peng Gao ()
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Ruochen Shi: Peking University
Qize Li: Peking University
Xiaofeng Xu: Chinese Academy of Sciences
Bo Han: Peking University
Ruixue Zhu: Peking University
Fachen Liu: Peking University
Ruishi Qi: University of California at Berkeley
Xiaowen Zhang: Peking University
Jinlong Du: Peking University
Ji Chen: Peking University
Dapeng Yu: Peking University
Xuetao Zhu: Chinese Academy of Sciences
Jiandong Guo: Chinese Academy of Sciences
Peng Gao: Peking University

Nature Communications, 2024, vol. 15, issue 1, 1-7

Abstract: Abstract In single unit-cell FeSe grown on SrTiO3, the superconductivity transition temperature features a significant enhancement. Local phonon modes at the interface associated with electron-phonon coupling may play an important role in the interface-induced enhancement. However, such phonon modes have eluded direct experimental observations. The complicated atomic structure of the interface brings challenges to obtain the accurate structure-phonon relation knowledge. Here, we achieve direct characterizations of atomic structure and phonon modes at the FeSe/SrTiO3 interface with atomically resolved imaging and electron energy loss spectroscopy in an electron microscope. We find several phonon modes highly localized (~1.3 nm) at the unique double layer Ti-O terminated interface, one of which (~ 83 meV) engages in strong interactions with the electrons in FeSe based on ab initio calculations. This finding of the localized interfacial phonon associated with strong electron-phonon coupling provides new insights into understanding the origin of superconductivity enhancement at the FeSe/SrTiO3 interface.

Date: 2024
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DOI: 10.1038/s41467-024-47688-5

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