Path-integral theory for spectral evolution of angle resolved photoemission from Gaussian to two-headed Lorentzian due to electron–phonon couplings

We report a theoretical study on the angle resolved photoemission spectra (ARPES) of electron–phonon (e–ph) coupled systems using a path-integral theory. When the e–ph coupling strength is intermediate, the resultant spectrum around the band bottom takes a broad Gaussian distribution, indicating the...

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Bibliographic Details
Published in:Journal of electron spectroscopy and related phenomena 2005-06, Vol.144 (Complete), p.1233-1236
Main Authors: Ji, Kai, Nasu, Keiichiro
Format: Article
Language:English
Subjects:
Electron–phonon interaction
Photoemission spectrum
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Summary:We report a theoretical study on the angle resolved photoemission spectra (ARPES) of electron–phonon (e–ph) coupled systems using a path-integral theory. When the e–ph coupling strength is intermediate, the resultant spectrum around the band bottom takes a broad Gaussian distribution, indicating the electron in this state is nearly localized as being incoherent. On the other hand, near the Fermi surface, the resultant spectral shape is characterized by an asymmetric two-headed Lorentzian form, which means the electron in this state is almost coherent with a plane wave nature extending over all crystal. These results are in good agreement with recent discoveries of high resolution ARPES on the Be(0 0 0 1) surface and Bi 2 Sr 2 CaCu 2 O 8 .
ISSN:0368-2048
1873-2526
DOI:10.1016/j.elspec.2005.01.006