Quasiparticle dispersion of the insulating copper oxide Sr{sub 2}CuO{sub 2}Cl{sub 2} by employing vertical and horizontal double hoppings

Journal Article · Tue Oct 01 04:00:00 EDT 1996 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.54.10125· OSTI ID:385708

Kyung, B; Ferrell, R A ^[1]

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1. Department of Physics, Center for Superconductivity Research, University of Maryland, College Park, Maryland 20742 (United States)

By adding horizontal and vertical double hoppings to the {ital t}-{ital t}{sup {prime}}-{ital J} Hamiltonian, we can reproduce the experimentally determined quasiparticle dispersion data for Sr{sub 2}CuO{sub 2}Cl{sub 2} reasonably well (in both shape and bandwidth) in most of the Brillouin zone. These numerical results have been obtained by using the self-consistent noncrossing approximation. An alternative simplified calculation using first-order perturbation theory gives closely similar results. The strong coupling to magnons plays an important role in guaranteeing a reasonable bandwidth and reproducing the observed peak strength of the photoemission spectrum. The present study indicates the importance of the horizontal and vertical double hoppings in fitting various experimental results within the one-band model. {copyright} {ital 1996 The American Physical Society.}

• OSTI ID: 385708
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 14 Vol. 54; ISSN 0163-1829; ISSN PRBMDO
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
BAND THEORY
BRILLOUIN ZONES
COPPER OXIDES
DISPERSION RELATIONS
ELECTRON CORRELATION
HIGH-TC SUPERCONDUCTORS
MAGNONS
OPTICAL PROPERTIES
PHOTOEMISSION
STRONTIUM CHLORIDES