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Fermi surface of Bi2Sr2CaCu2O8

Fretwell¹, Kaminski, Mesot

¹Department of Physics, University of Illinois at Chicago, Chicago, Illinois 60607, USA.

Physical Review Letters

|September 16, 2000

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Angle Resolved Photoemission Spectroscopy (ARPES) reveals the Fermi surface of Bi2Sr2CaCu2O8 is a large hole barrel. This finding is independent of photon energy, contrary to other suggestions.

Area of Science:

Condensed Matter Physics
Materials Science
Quantum Materials

Background:

Understanding the electronic structure of high-temperature superconductors like Bi2Sr2CaCu2O8 is crucial.
Previous studies have presented conflicting interpretations of the Fermi surface topology.

Purpose of the Study:

To accurately determine the Fermi surface of Bi2Sr2CaCu2O8 using high-resolution ARPES.
To resolve discrepancies regarding the Fermi surface shape and its dependence on experimental parameters.

Main Methods:

Utilizing angle-resolved photoemission spectroscopy (ARPES) with high momentum resolution (~0.01 Brillouin zone).
Performing measurements across different incident photon energies to probe energy independence.

Main Results:

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The ARPES-derived Fermi surface is consistently observed as a large hole barrel centered at (π,π).
This Fermi surface topology is independent of the incident photon energy used in the ARPES measurements.
Demonstrated that matrix element effects can distort ARPES intensity interpretations if not carefully considered.

Conclusions:

The electronic structure of Bi2Sr2CaCu2O8 features a robust hole barrel Fermi surface.
Photon energy dependence in ARPES data analysis requires careful consideration of matrix elements to avoid misinterpretation.