Journal
INTERNATIONAL JOURNAL OF MODERN PHYSICS B
Volume 32, Issue 8, Pages -Publisher
WORLD SCIENTIFIC PUBL CO PTE LTD
DOI: 10.1142/S0217979218500947
Keywords
Momentum-resolved photo-electron emission; exciton wavefunction
Funding
- JSPS [24000006]
- Grants-in-Aid for Scientific Research [24000006] Funding Source: KAKEN
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We study conceptional problems of a photo-electron emission (PEE) process from a free exciton in insulating crystals. In this PEE process, only the electron constituting the exciton is suddenly emitted out of the crystal, while the hole constituting the exciton is still left inside and forced to be recoiled back to its original valence band. This recoil on the hole is surely reflected in the spectrum of the PEE with a statistical distribution along the momentum energy curve of the valence band. This distribution is nothing but the square of the exciton wavefunction amplitude, since it shows how the electron and the hole are originally bound together. Thus, the momentum-resolved PEE can directly determine the exciton wavefunction. These problems are clarified, taking the Gamma and the saddle point excitons in GaAs, as typical examples. New PEE experiments are also suggested.
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