Title: Fermiho plocha a efetivne Hmotnosti ako merane vo fotoemisii BaKFe2As2 supravodica
Fermi surface and effective masses in photoemission response of the (Ba1−xKx)Fe2As2 superconductor
Authors: Derondeau, Gerald
Bisti, Federico
Kobayashi, Masaki
Braun, Jürgen
Ebert, Hubert
Rogalev, Victor A.
Shi, Ming
Schmitt, Thorsten
Ma, Junzhang
Ding, Hong
Strocov, Vladimir N.
Minár, Jan
Citation: DERONDEAU, G., BISTI, F., KOBAYASHI, M., BRAUN, J., EBERT, H., ROGALEV, V. A., SHI, M., SCHMITT, T., MA, J., DING, H., STROCOV, V. N., MINÁR, J. Fermi surface and effective masses in photoemission response of the (Ba1−xKx)Fe2As2 superconductor. Scientific Reports, 2017, roč. 7, č. AUG 18 2017. ISSN 2045-2322.
Issue Date: 2017
Publisher: Nature Publishing Group
Document type: článek
URI: http://hdl.handle.net/11025/29262
ISSN: 2045-2322
Keywords: ARPES, supervodic, DMFT, jednokrokovy model fotoemissie
Keywords in different language: ARPES, superconductors, DMFT, one-step model
Abstract: Experimentálne a teoreticky sme skúmali uhlovo rozlíšenú fotoemissiu na BaKFe2As2 supravodiči kde sme koherentne vzali do úvahy spino-orbitálnu interakciu, neusporiadanosť a elektrónové korelácie. Ukázali sme efekt fotoemisných maticových elementov na spetrálnu funkciu a detailne sme analyzovali efektívne hmotnosti a renormalizáciu.
Abstract in different language: The angle-resolved photoemission spectra of the superconductor (Ba1−xKx)Fe2As2 have been investigated accounting coherently for spin-orbit coupling, disorder and electron correlation effects in the valence bands combined with final state, matrix element and surface effects. Our results explain the previously obscured origins of all salient features of the ARPES response of this paradigm pnictide compound and reveal the origin of the Lifshitz transition. Comparison of calculated ARPES spectra with the underlying DMFT band structure shows an important impact of final state effects, which result for three-dimensional states in a deviation of the ARPES spectra from the true spectral function. In particular, the apparent effective mass enhancement seen in the ARPES response is not an entirely intrinsic property of the quasiparticle valence bands but may have a significant extrinsic contribution from the photoemission process and thus differ from its true value. Because this effect is more pronounced for low photoexcitation energies, soft-X-ray ARPES delivers more accurate values of the mass enhancement due to a sharp definition of the 3D electron momentum. To demonstrate this effect in addition to the theoretical study, we show here new state of the art soft-X-ray and polarisation dependent ARPES measurments.
Rights: © Nature Publishing Group
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