Fermi surface and effective masses in photoemission response of the (Ba1−x K x )Fe2As2 superconductor

Abstract The angle-resolved photoemission spectra of the superconductor (Ba1−x K x )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 e...

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Autores principales:	Gerald Derondeau, Federico Bisti, Masaki Kobayashi, Jürgen Braun, Hubert Ebert, Victor A. Rogalev, Ming Shi, Thorsten Schmitt, Junzhang Ma, Hong Ding, Vladimir N. Strocov, Ján Minár
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/6639c60891a14a9c95f4b7ae210d5382
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spelling	oai:doaj.org-article:6639c60891a14a9c95f4b7ae210d53822021-12-02T12:32:03ZFermi surface and effective masses in photoemission response of the (Ba1−x K x )Fe2As2 superconductor10.1038/s41598-017-09480-y2045-2322https://doaj.org/article/6639c60891a14a9c95f4b7ae210d53822017-08-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-09480-yhttps://doaj.org/toc/2045-2322Abstract The angle-resolved photoemission spectra of the superconductor (Ba1−x K x )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.Gerald DerondeauFederico BistiMasaki KobayashiJürgen BraunHubert EbertVictor A. RogalevMing ShiThorsten SchmittJunzhang MaHong DingVladimir N. StrocovJán MinárNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-8 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Gerald Derondeau Federico Bisti Masaki Kobayashi Jürgen Braun Hubert Ebert Victor A. Rogalev Ming Shi Thorsten Schmitt Junzhang Ma Hong Ding Vladimir N. Strocov Ján Minár Fermi surface and effective masses in photoemission response of the (Ba1−x K x )Fe2As2 superconductor
description	Abstract The angle-resolved photoemission spectra of the superconductor (Ba1−x K x )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.
format	article
author	Gerald Derondeau Federico Bisti Masaki Kobayashi Jürgen Braun Hubert Ebert Victor A. Rogalev Ming Shi Thorsten Schmitt Junzhang Ma Hong Ding Vladimir N. Strocov Ján Minár
author_facet	Gerald Derondeau Federico Bisti Masaki Kobayashi Jürgen Braun Hubert Ebert Victor A. Rogalev Ming Shi Thorsten Schmitt Junzhang Ma Hong Ding Vladimir N. Strocov Ján Minár
author_sort	Gerald Derondeau
title	Fermi surface and effective masses in photoemission response of the (Ba1−x K x )Fe2As2 superconductor
title_short	Fermi surface and effective masses in photoemission response of the (Ba1−x K x )Fe2As2 superconductor
title_full	Fermi surface and effective masses in photoemission response of the (Ba1−x K x )Fe2As2 superconductor
title_fullStr	Fermi surface and effective masses in photoemission response of the (Ba1−x K x )Fe2As2 superconductor
title_full_unstemmed	Fermi surface and effective masses in photoemission response of the (Ba1−x K x )Fe2As2 superconductor
title_sort	fermi surface and effective masses in photoemission response of the (ba1−x k x )fe2as2 superconductor
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/6639c60891a14a9c95f4b7ae210d5382
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_version_	1718394161520967680

Fermi surface and effective masses in photoemission response of the (Ba1−x K x )Fe2As2 superconductor

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