Reconstruction of the Bi2Sr2CaCu2O8+δ Fermi surface

The effects of structural supermodulation with the period λ ≈ 26 Å along the b axis of Bi2Sr2CaCu2O8+δ have been observed in photoemission studies from the early days as the presence of "diffraction replicas" of the intrinsic electronic structure. Although predicted to affect the electroni...

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Bibliographic Details
Published in:Physical review. B 2019-12, Vol.100 (24), p.1
Main Authors: Valla, T, Pletikosić, I, Drozdov, I K, Gu, G D
Format: Article
Language:English
Subjects:
Banded structure
Electronic structure
Electrons
Fermi surfaces
Hybridization
Photoelectric emission
Reconstruction
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Summary:The effects of structural supermodulation with the period λ ≈ 26 Å along the b axis of Bi2Sr2CaCu2O8+δ have been observed in photoemission studies from the early days as the presence of "diffraction replicas" of the intrinsic electronic structure. Although predicted to affect the electronic structure of the Cu-O plane, the influence of supermodulation potential on Cu-O electrons has never been observed in photoemission. In the present study, we clearly see the effects on the Bi2Sr2CaCu2O8+δ electronic structure; we observe a hybridization of the intrinsic bands with the supermodulation replica bands in the form of avoided crossings and a corresponding reconstruction of the Fermi surface. We estimate the hybridization gap, 2Δh ∼ 25 meV, in the slightly underdoped samples. The hybridization weakens with doping and the anticrossing can no longer be resolved in strongly overdoped samples. In contrast, the "shadow" replica, shifted by ( π , π ) , is found not to hybridize with the original bands within our detection limits.
ISSN:2469-9950
2469-9969
DOI:10.1103/PhysRevB.100.241112