Orbital-Selective High-Temperature Cooper Pairing Developed inthe Two-Dimensional Limit
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Orbital-Selective High-Temperature Cooper Pairing Developed inthe Two-Dimensional Limit. / Liu, Chaofei; Kreisel, Andreas; Zhong, Shan; Li, Yu; Andersen, Brian M.; Hirschfeld, Peter; Wang, Jian.
In: Nano Letters, Vol. 22, No. 8, 27.04.2022, p. 3245-3251.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Orbital-Selective High-Temperature Cooper Pairing Developed inthe Two-Dimensional Limit
AU - Liu, Chaofei
AU - Kreisel, Andreas
AU - Zhong, Shan
AU - Li, Yu
AU - Andersen, Brian M.
AU - Hirschfeld, Peter
AU - Wang, Jian
PY - 2022/4/27
Y1 - 2022/4/27
N2 - For multiband superconductors, the orbital multiplicity yields orbitaldifferentiation in normal-state properties and can lead to orbital-selective spin-fluctuation Cooper pairing. The orbital-selective phenomenon has becomeincreasingly pivotal in clarifying the pairing"enigma", particularly for multibandhigh-temperature superconductors. Meanwhile, in one-unit-cell (1-UC) FeSe/SrTiO3, since the standard electron-hole Fermi pocket nesting scenario isinapplicable, the actual pairing mechanism is subject to intense debate. Here, bymeasuring high-resolution Bogoliubovquasiparticle interference, we reportobservations of highly anisotropic magnetic Cooper pairing in 1-UC FeSe.Theoretically, it is important to incorporate orbitally selective effects of electroniccorrelations within a spin-fluctuation pairing calculation, where the dxyorbitalbecomes coherence-suppressed. The resulting pairing gap is compatible with theexperimentalfindings, which suggests that high-TcCooper pairing with orbitalselectivity applies to 2D-limit 1-UC FeSe. Ourfindings imply the general existence of orbital selectivity in iron-basedsuperconductors and the universal significance of electron correlations in high-Tcsuperconductors
AB - For multiband superconductors, the orbital multiplicity yields orbitaldifferentiation in normal-state properties and can lead to orbital-selective spin-fluctuation Cooper pairing. The orbital-selective phenomenon has becomeincreasingly pivotal in clarifying the pairing"enigma", particularly for multibandhigh-temperature superconductors. Meanwhile, in one-unit-cell (1-UC) FeSe/SrTiO3, since the standard electron-hole Fermi pocket nesting scenario isinapplicable, the actual pairing mechanism is subject to intense debate. Here, bymeasuring high-resolution Bogoliubovquasiparticle interference, we reportobservations of highly anisotropic magnetic Cooper pairing in 1-UC FeSe.Theoretically, it is important to incorporate orbitally selective effects of electroniccorrelations within a spin-fluctuation pairing calculation, where the dxyorbitalbecomes coherence-suppressed. The resulting pairing gap is compatible with theexperimentalfindings, which suggests that high-TcCooper pairing with orbitalselectivity applies to 2D-limit 1-UC FeSe. Ourfindings imply the general existence of orbital selectivity in iron-basedsuperconductors and the universal significance of electron correlations in high-Tcsuperconductors
KW - one-unit-cell FeSe
KW - SrTiO3
KW - Bogoliubov quasiparticle interference
KW - self-energy
KW - orbital selectivity
KW - Cooper pairing
KW - SUPERCONDUCTIVITY
KW - FESE
KW - LIFETIME
U2 - 10.1021/acs.nanolett.1c04863
DO - 10.1021/acs.nanolett.1c04863
M3 - Journal article
C2 - 35416679
VL - 22
SP - 3245
EP - 3251
JO - Nano Letters
JF - Nano Letters
SN - 1530-6984
IS - 8
ER -
ID: 315529981