Evolution of spin excitations from bulk to monolayer FeSe

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 and Riccardo Comin ()
Additional contact information
Jonathan Pelliciari: Massachusetts Institute of Technology
Seher Karakuzu: Oak Ridge National Laboratory
Qi Song: Fudan University
Riccardo Arpaia: Politecnico di Milano
Abhishek Nag: Diamond Light Source
Matteo Rossi: Politecnico di Milano
Jiemin Li: Diamond Light Source
Tianlun Yu: Fudan University
Xiaoyang Chen: Fudan University
Rui Peng: Fudan University
Mirian García-Fernández: Diamond Light Source
Andrew C. Walters: Diamond Light Source
Qisi Wang: Fudan University
Jun Zhao: Fudan University
Giacomo Ghiringhelli: Politecnico di Milano
Donglai Feng: Fudan University
Thomas A. Maier: Oak Ridge National Laboratory
Ke-Jin Zhou: Diamond Light Source
Steven Johnston: The University of Tennessee
Riccardo Comin: Massachusetts Institute of Technology

Nature Communications, 2021, vol. 12, issue 1, 1-8

Abstract: Abstract In ultrathin films of FeSe grown on SrTiO3 (FeSe/STO), the superconducting transition temperature Tc is increased by almost an order of magnitude, raising questions on the pairing mechanism. As in other superconductors, antiferromagnetic spin fluctuations have been proposed to mediate SC making it essential to study the evolution of the spin dynamics of FeSe from the bulk to the ultrathin limit. Here, we investigate the spin excitations in bulk and monolayer FeSe/STO using resonant inelastic x-ray scattering (RIXS) and quantum Monte Carlo (QMC) calculations. Despite the absence of long-range magnetic order, bulk FeSe displays dispersive magnetic excitations reminiscent of other Fe-pnictides. Conversely, the spin excitations in FeSe/STO are gapped, dispersionless, and significantly hardened relative to its bulk counterpart. By comparing our RIXS results with simulations of a bilayer Hubbard model, we connect the evolution of the spin excitations to the Fermiology of the two systems revealing a remarkable reconfiguration of spin excitations in FeSe/STO, essential to understand the role of spin fluctuations in the pairing mechanism.

Date: 2021
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DOI: 10.1038/s41467-021-23317-3

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