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Evolution of spin excitations from bulk to monolayer FeSe

Physics

Evolution of spin excitations from bulk to monolayer FeSe

J. Pelliciari, S. Karakuzu, et al.

Discover the revolutionary findings on ultrathin FeSe films grown on SrTiO3, revealing a significant transformation in superconductivity through advanced techniques like resonant inelastic x-ray scattering and quantum Monte Carlo calculations. The collaborative research by Jonathan Pelliciari, Seher Karakuzu, and their team sheds light on the evolution of spin excitations, offering crucial insights into the pairing mechanism behind these remarkable materials.

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Playback language: English
Abstract
Ultrathin films of FeSe grown on SrTiO3 (FeSe/STO) exhibit a dramatic increase in superconducting transition temperature (Tc), prompting investigations into the underlying pairing mechanism. This study uses resonant inelastic x-ray scattering (RIXS) and quantum Monte Carlo (QMC) calculations to analyze spin excitations in bulk and monolayer FeSe/STO. While bulk FeSe displays dispersive magnetic excitations, FeSe/STO shows gapped, dispersionless, and significantly hardened excitations. By comparing RIXS results with simulations of a bilayer Hubbard model, the researchers link the evolution of spin excitations to the Fermiology of the two systems, revealing a remarkable reconfiguration of spin excitations in FeSe/STO crucial for understanding the role of spin fluctuations in the pairing mechanism.
Publisher
NATURE COMMUNICATIONS
Published On
May 25, 2021
Authors
Jonathan Pelliciari, Seher Karakuzu, Qi Song, Riccardo Arpaia, Abhishek Nag, Matteo Rossi, Jiemin Li, Tianlun Yu, Xiaoyang Chen, Rui Peng, Mirian García-Fernández, Andrew C. Walters, Qisi Wang, Jun Zhao, Giacomo Ghiringhelli, Donglai Feng, Thomas A. Maier, Ke-Jin Zhou, Steven Johnston, Riccardo Comin
Tags
FeSe
superconductivity
spin excitations
SrTiO3
quantum Monte Carlo
resonant inelastic x-ray scattering
pairing mechanism
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