Photoemission tomography of excitons in 2D systems: momentum-space signatures of correlated electron-hole wave functions
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arXiv
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| Autori principali: | , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866908721218584576 |
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| author | Kaidisch, Siegfried Kleiner, Amir Refaely-Abramson, Sivan Puschnig, Peter Kern, Christian S. |
| author_facet | Kaidisch, Siegfried Kleiner, Amir Refaely-Abramson, Sivan Puschnig, Peter Kern, Christian S. |
| contents | The momentum-space signatures of excitons can be experimentally accessed through time-resolved (pump-probe) photoelectron spectroscopy. In this work, we develop a computational framework for exciton photoemission orbital tomography (exPOT) in periodic systems, enabling the simulation and interpretation of experimental observables within many-body perturbation theory. By connecting the GW +Bethe-Salpeter equation (BSE) approach to photoemission tomography, our formalism captures exciton photoemission in periodic systems, explicitly incorporating photoemission matrix element effects induced by the light-matter interaction via the probe pulse. The correlated nature of electrons and holes introduces distinct consequences for excitonic photoemission. Using the prototypical two-dimensional material hexagonal boron nitride, we demonstrate these effects, including a dependence of the photoemission angular distribution on the pump pulse polarization. Moreover, our framework extends to excitons with finite center-of-mass momentum, making it well-suited to studying momentum-dark excitons. This provides valuable insights into the microscopic nature of excitonic phenomena in quantum materials. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2511_14956 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Photoemission tomography of excitons in 2D systems: momentum-space signatures of correlated electron-hole wave functions Kaidisch, Siegfried Kleiner, Amir Refaely-Abramson, Sivan Puschnig, Peter Kern, Christian S. Materials Science The momentum-space signatures of excitons can be experimentally accessed through time-resolved (pump-probe) photoelectron spectroscopy. In this work, we develop a computational framework for exciton photoemission orbital tomography (exPOT) in periodic systems, enabling the simulation and interpretation of experimental observables within many-body perturbation theory. By connecting the GW +Bethe-Salpeter equation (BSE) approach to photoemission tomography, our formalism captures exciton photoemission in periodic systems, explicitly incorporating photoemission matrix element effects induced by the light-matter interaction via the probe pulse. The correlated nature of electrons and holes introduces distinct consequences for excitonic photoemission. Using the prototypical two-dimensional material hexagonal boron nitride, we demonstrate these effects, including a dependence of the photoemission angular distribution on the pump pulse polarization. Moreover, our framework extends to excitons with finite center-of-mass momentum, making it well-suited to studying momentum-dark excitons. This provides valuable insights into the microscopic nature of excitonic phenomena in quantum materials. |
| title | Photoemission tomography of excitons in 2D systems: momentum-space signatures of correlated electron-hole wave functions |
| topic | Materials Science |
| url | https://arxiv.org/abs/2511.14956 |