How do you approach the analysis and interpretation of data obtained from angle-resolved photoemission spectroscopy in condensed matter physics?

Sample interview questions: How do you approach the analysis and interpretation of data obtained from angle-resolved photoemission spectroscopy in condensed matter physics?

Sample answer:

Data Analysis and Interpretation in Angle-Resolved Photoemission Spectroscopy (ARPES)

1. Energy-Momentum Dispersion Maps:

   • Extract band dispersion curves by plotting the binding energy as a function of momentum (k-vector).
   • Identify electronic states, such as valence bands, conduction bands, and surface states.

2. Fermi Surface Mapping:

   • Determine the shape and extent of the Fermi surface by measuring the energy distribution at the Fermi level.
   • Provide insights into the effective mass and carrier density of the material.

3. Band Structure Calculations:

   • Compare experimental data with theoretical calculations to validate the band structure.
   • Identify discrepancies that may indicate novel electronic properties or defects.

4. Surface and Interface Characterization:

   • Measure the surface electronic states and interface bonding between different materials.
   • Probe the electronic structure of thin films, heterostructures, and surfaces.

5. Correlation Effects Analysis:

   • Observe deviations from non-interacting band structure predic… Read full answer

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