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Multiplex Chemical Imaging Based on Broadband Stimulated Raman Scattering Microscopy
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An electron-boson glue function derived from electronic Raman scattering.

B Muschler1, W Prestel, E Schachinger

  • 1Walther Meissner Institut, Bayerische Akademie der Wissenschaften, Garching, Germany.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|March 16, 2011
PubMed
Summary
This summary is machine-generated.

Raman scattering measurements in cuprates reveal distinct electron-boson spectral densities. The B(2g) symmetry aligns with nodal ARPES, while B(1g) resembles optical conductivity, highlighting different electronic contributions.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Spectroscopy

Background:

  • Raman scattering cross sections are sensitive to photon polarization.
  • Cuprates exhibit distinct nodal and antinodal contributions in B(2g) and B(1g) Raman symmetries, respectively.
  • Angle-resolved photoemission spectroscopy (ARPES) and optical conductivity probe electronic properties differently, with ARPES focusing on specific momentum directions and optical conductivity averaging over the Brillouin zone.

Purpose of the Study:

  • To extract electron-boson spectral densities from B(1g) and B(2g) Raman response data in high-quality Bi(2)Sr(2)CaCu(2)O(8 + δ) single crystals.
  • To compare these extracted spectral densities with those obtained from ARPES and optical conductivity measurements.
  • To investigate the role of (π, π) scattering in cuprates at specific energy scales.

Main Methods:

  • Measurement of Raman response data on Bi(2)Sr(2)CaCu(2)O(8 + δ) single crystals up to high energies.
  • Inversion of Raman data using a modified maximum entropy technique to obtain electron-boson spectral densities.
  • Comparison of Raman-derived spectral densities with existing ARPES and optical conductivity data.

Main Results:

  • The extracted B(2g) electron-boson spectral density qualitatively agrees with nodal direction ARPES data.
  • The B(1g) electron-boson spectral density shows closer resemblance to the optical conductivity spectrum.
  • A significant peak around 30-40 meV is observed in the B(1g) spectrum, with a less pronounced feature in the B(2g) spectrum, suggesting the importance of (π, π) scattering.

Conclusions:

  • Raman scattering, particularly with polarization-resolved B(1g) and B(2g) symmetries, provides complementary information to ARPES and optical conductivity for understanding electron-boson interactions in cuprates.
  • The findings support the significance of (π, π) scattering at approximately 30-40 meV in Bi(2)Sr(2)CaCu(2)O(8 + δ).
  • Different Raman symmetries probe distinct aspects of the electronic structure and interactions in these high-temperature superconductors.