Lippmann-Schwinger Approach for Accurate Photoelectron Wave Functions and Angle-Resolved Photoemission Spectra from First Principles.

Phys Rev Lett

Seoul National University, Seoul National University, Department of Physics and Astronomy, Seoul 08826, Korea and Center for Theoretical Physics, Seoul 08826, Korea.

Published: August 2025


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Article Abstract

We present a conceptually simple and technically straightforward method for calculating photoelectron wave functions that is easily integrable with standard wave-function-based density-functional-theory packages. Our method is based on the Lippmann-Schwinger equation, naturally incorporating the boundary condition that the final photoelectron state must satisfy. The calculated results are in good agreement with the measured photon-energy and polarization dependence of the angle-resolved photoemission spectroscopy (ARPES) of graphene, the photon-energy-dependent evolution of the so-called dark corridor arising from the pseudospin, and WSe_{2}, the circular dichroism reflecting the hidden orbital polarization. Our Letter opens doors to do-it-yourself simulations of ARPES with standard density-functional-theory packages, of crucial importance in the era of "quantum materials," whose key experimental tool is ARPES.

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http://dx.doi.org/10.1103/gwmm-6l57DOI Listing

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Lippmann-Schwinger Approach for Accurate Photoelectron Wave Functions and Angle-Resolved Photoemission Spectra from First Principles.

Phys Rev Lett

August 2025

Seoul National University, Seoul National University, Department of Physics and Astronomy, Seoul 08826, Korea and Center for Theoretical Physics, Seoul 08826, Korea.

We present a conceptually simple and technically straightforward method for calculating photoelectron wave functions that is easily integrable with standard wave-function-based density-functional-theory packages. Our method is based on the Lippmann-Schwinger equation, naturally incorporating the boundary condition that the final photoelectron state must satisfy. The calculated results are in good agreement with the measured photon-energy and polarization dependence of the angle-resolved photoemission spectroscopy (ARPES) of graphene, the photon-energy-dependent evolution of the so-called dark corridor arising from the pseudospin, and WSe_{2}, the circular dichroism reflecting the hidden orbital polarization.

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