2020
DOI: 10.1038/s42005-020-0319-1
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Absence of Y-pocket in 1-Fe Brillouin zone and reversed orbital occupation imbalance in FeSe

Abstract: The FeSe nematic phase has been the focus of recent research on iron-based superconductors (IBSs) due to its unusual properties, which are distinct from those of the pnictides. A series of theoretical/experimental studies were performed to determine the origin of the nematic phase. However, they yielded conflicting results and caused additional controversies. Here, we report the results of angle-resolved photoemission and X-ray absorption spectroscopy studies on FeSe detwinned by a piezo stack. We fully resolv… Show more

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Cited by 41 publications
(50 citation statements)
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“…Those measurements could only observe one of the the two crossed "peanut-shaped" electron pockets at the X point [106,[109][110][111]; similar conclusions were reported recently using nano ARPES [112] within individual nematic domains. Various explanations for this dramatic consequence of nematicity were offered, including selection rules specific to ARPES [110], strong correlation effects rendering some of the electronic states less coherent [20], unusual band shifts and hybridization of bands [113,114]; some data of these experiments are shown in Figure 4e-g. Finally, evidence for an additional band splitting was reported, which could be due to magnetism or SOC on the surface [115].…”
Section: Electronic Structure Of Fesementioning
confidence: 99%
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“…Those measurements could only observe one of the the two crossed "peanut-shaped" electron pockets at the X point [106,[109][110][111]; similar conclusions were reported recently using nano ARPES [112] within individual nematic domains. Various explanations for this dramatic consequence of nematicity were offered, including selection rules specific to ARPES [110], strong correlation effects rendering some of the electronic states less coherent [20], unusual band shifts and hybridization of bands [113,114]; some data of these experiments are shown in Figure 4e-g. Finally, evidence for an additional band splitting was reported, which could be due to magnetism or SOC on the surface [115].…”
Section: Electronic Structure Of Fesementioning
confidence: 99%
“…Recently, evidence for the second pocket at the Y point has been reported in the literature as well [117,118] suggesting that a detailed understanding of this issue might also be related to shifts of the d xz and d yz orbital states in the orthorhombic state. Depending on the assignments of peaks in the measured spectral function to bands at the X-point, a large splitting of 50 meV [109,113,116,119] or much smaller splitting of 10 meV [107,110] has been deduced, while in both scenarios the sign of the splitting is reversed between the Γ point and the X point [106]-similar to findings in Ba122 [120]. The four branches of oscillation frequencies observed in quantum oscillations of the resistivity [92,121,122] correspond to the extremely small areas of the Fermi surface sheets covering only few percent of the Brillouin zone.…”
Section: Electronic Structure Of Fesementioning
confidence: 99%
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“…Therefore conventional ARPES measurements will usually detect a superposition from both domains with approximately equal intensity. Several groups have attempted to overcome this limitation by aligning the orthorhombic domains along a preferential axis by applying uniaxial strain [17][18][19][20], commonly known as "detwinning." These measurements revealed a single elliptical holelike pocket at the Brillouin zone center, in line with theoretical predictions [21].…”
Section: Introductionmentioning
confidence: 99%