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Auxiliary fermion approach to the resonant inelastic x-ray scattering response in an underdoped cuprate

Shi, Y; James, AJA; Demler, E; Klich, I; (2017) Auxiliary fermion approach to the resonant inelastic x-ray scattering response in an underdoped cuprate. Physical Review B , 96 (15) , Article 155101. 10.1103/PhysRevB.96.155101. Green open access

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Abstract

We describe a method for calculating the resonant inelastic x-ray scattering (RIXS) response—including the dynamics of the transient core hole—of many-body systems with nontrivial gap structure encoded in their single particle Green's function. Our approach introduces auxiliary fermions in order to obtain a form amenable to the determinant method of Benjamin et al., [Phys. Rev. Lett. 112, 247002 (2014)], and is applicable to systems where interactions are most strongly felt through a renormalization of the single particle propagator. As a test case we consider the Yang-Rice-Zhang ansatz for cuprate phenomena in the underdoped “pseudogap” regime, which remains a popular tool for interpreting the results of experimental probes. We show that taking the core hole dynamics into account for a system described by this ansatz pushes the RIXS peaks towards higher energy transfer, improving agreement with experiments.

Type: Article
Title: Auxiliary fermion approach to the resonant inelastic x-ray scattering response in an underdoped cuprate
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevB.96.155101
Publisher version: https://doi.org/10.1103/PhysRevB.96.155101
Language: English
Additional information: This is the published version of record. For information on re-use, please refer to the publisher’s terms and conditions.
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology
URI: http://discovery.ucl.ac.uk/id/eprint/10026206
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