动量分辨电子-声子耦合的实验测定

Experimental Determination of Momentum-Resolved Electron-Phonon Coupling.

作者信息

Rossi Matteo, Arpaia Riccardo, Fumagalli Roberto, Moretti Sala Marco, Betto Davide, Kummer Kurt, De Luca Gabriella M, van den Brink Jeroen, Salluzzo Marco, Brookes Nicholas B, Braicovich Lucio, Ghiringhelli Giacomo

机构信息

Dipartimento di Fisica, Politecnico di Milano, Piazza Leonardo da Vinci 32, I-20133 Milano, Italy.

Department of Microtechnology and Nanoscience, Chalmers University of Technology, SE-41296 Göteborg, Sweden.

出版信息

Phys Rev Lett. 2019 Jul 12;123(2):027001. doi: 10.1103/PhysRevLett.123.027001.

DOI:10.1103/PhysRevLett.123.027001

PMID:31386544

Abstract

We provide a novel experimental method to quantitatively estimate the electron-phonon coupling and its momentum dependence from resonant inelastic x-ray scattering (RIXS) spectra based on the detuning of the incident photon energy away from an absorption resonance. We apply it to the cuprate parent compound NdBa_{2}Cu_{3}O_{6} and find that the electronic coupling to the oxygen half-breathing phonon branch is strongest at the Brillouin zone boundary, where it amounts to ∼0.17 eV, in agreement with previous studies. In principle, this method is applicable to any absorption resonance suitable for RIXS measurements and will help to define the contribution of lattice vibrations to the peculiar properties of quantum materials.

摘要

我们提供了一种新颖的实验方法，用于基于入射光子能量与吸收共振的失谐，从共振非弹性X射线散射（RIXS）光谱定量估计电子-声子耦合及其动量依赖性。我们将其应用于铜酸盐母体化合物NdBa₂Cu₃O₆，发现与氧半呼吸声子分支的电子耦合在布里渊区边界处最强，达到约0.17 eV，这与先前的研究一致。原则上，该方法适用于任何适合RIXS测量的吸收共振，并将有助于确定晶格振动对量子材料特殊性质的贡献。