X-ray photoemission spectroscopy in the Falicov-Kimball model

Pakhira, Nandan; Shvaika, A. M.; Freericks, J. K.

doi:10.1103/physrevb.99.125137

Title: X-ray photoemission spectroscopy in the Falicov-Kimball model

Journal Article · Thu Mar 21 00:00:00 EDT 2019 · Physical Review B

DOI:https://doi.org/10.1103/physrevb.99.125137· OSTI ID:1610014

Pakhira, Nandan ^[1]; Shvaika, A. M. ^[2]; Freericks, J. K. ^[3]

Indian Inst. of Technology, West Bengal (India); Kazi Nazrul Univ., West Bengal (India)
Inst. for Condensed Matter Physics of the National Academy of Sciences of Ukraine, Lviv (Ukraine)
Georgetown Univ., Washington, DC (United States)

We calculate the finite temperature x-ray photoemission spectroscopy for the Falicov-Kimball model using a Wiener-Hopf sum equation approach. In the metallic state, the core-hole spectral function shows two side peaks corresponding to the creation of a core hole on an empty site (or a doubly occupied site) and also has two nearly degenerate central peaks (because of our choice of the model parameters) corresponding to the creation of a core hole on a singly occupied site. The nearly doubly degenerate central peaks merge into a single peak at higher temperatures. In the insulating state, we obtain two peaks and a strongly temperature dependent low-energy peak corresponding to the creation of a core hole on a thermally excited empty site. Furthermore, these results for the insulating state should be similar to those of the more general Hubbard model. Also, the strong correlations suggest that even without any additional broadening due to Auger-like processes, the core-hole lifetime will be short.

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Research Organization:: Georgetown Univ., Washington, DC (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division

Grant/Contract Number:: FG02-08ER46542

OSTI ID:: 1610014

Alternate ID(s):: OSTI ID: 1546189

Journal Information:: Physical Review B, Vol. 99, Issue 12; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 2 works

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