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24 April 2024 |
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Probing inter- and intrachain Zhang-Rice excitons in Li$_2$CuO$_2$ and determining their binding energy | | Claude Monney
; Valentina Bisogni
; Ke-Jin Zhou
; Roberto Kraus
; Vladimir Strocov
; Günter Behr
; Stefan-Ludwig Drechsler
; Helge Rosner
; Steve Johnston
; Jochen Geck
; Thorsten Schmitt
; | | Date: |
28 Sep 2016 | | Abstract: | Cuprate materials, like those hosting high temperature superconductivity,
represent a famous class of materials where the correlations between the
strongly entangled charges and spins produce complex phase diagrams. Several
years ago the Zhang-Rice singlet was proposed as a natural quasiparticle in
hole-doped cuprates. The occurance and binding energy of this quasiparticle,
consisting of a pair of bound holes with antiparallel spins on the same CuO$_4$
plaquette, depends on the local electronic interactions, which are fundamental
quantities for understanding the physics of the cuprates. Here, we employ
state-of-the-art Resonant Inelastic X-ray Scattering (RIXS) to probe the
correlated physics of the CuO$_4$ plaquettes in the quasi-one dimensional chain
cuprate Li$_2$CuO$_2$. By tuning the incoming photon energy to the O $K$-edge,
we populate bound states related to the Zhang-Rice quasiparticles in the RIXS
process. Both intra- and interchain Zhang-Rice singlets are observed and their
occurrence is shown to depend on the nearest-neighbor spin-spin correlations,
which are readily probed in this experiment. We also extract the binding energy
of the Zhang-Rice singlet and identify the Zhang-Rice triplet excitation in the
RIXS spectra. | | Source: | arXiv, 1609.8986 | | Services: | Forum | Review | PDF | Favorites | |
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