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Resonant Inelastic X-ray Scattering Studies of Elementary Excitations
In the past decade, resonant inelastic x-ray scattering (RIXS) has made remarkable progress as a spectroscopic technique. This is a direct result of the availability of high-brilliance synchrotron…
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Inelastic light scattering from correlated electrons
Inelastic light scattering is an intensively used tool in the study of electronic properties of solids. Triggered by the discovery of high-temperature superconductivity in the cuprates and by new…
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Symmetry-breaking orbital anisotropy observed for detwinned Ba(Fe1-xCox)2As2 above the spin density wave transition
Nematicity, defined as broken rotational symmetry, has recently been observed in competing phases proximate to the superconducting phase in the cuprate high-temperature superconductors. Similarly,…
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Quantum spin Hall state in monolayer 1T'-WTe2
A combination of photoemission and scanning tunnelling spectroscopy measurements provide compelling evidence that single layers of 1T'-WTe2 are a class of quantum spin Hall insulator. A quantum spin…
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Interfacial mode coupling as the origin of the enhancement of Tc in FeSe films on SrTiO3
TLDR
High-resolution angle-resolved photoemission spectroscopy results reveal an unexpected characteristic of the single-unit-cell FeSe/SrTiO3 system: shake-off bands suggesting the presence of bosonic modes, most probably oxygen optical phonons in SrTiO2, which couple to the FeSe electrons with only a small momentum transfer.
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Abrupt onset of a second energy gap at the superconducting transition of underdoped Bi2212
TLDR
Underdoped high-Tc superconducting copper oxides is found to have a gap that opens at Tc and has a canonical (BCS-like) temperature dependence accompanied by the appearance of the so-called Bogoliubov quasi-particles, a classical signature of superconductivity.
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Energy gaps in high-transition-temperature cuprate superconductors
The superconducting energy gap is perhaps the best-known of the spectral gaps in a superconductor, but there are many other types, including density waves and the mysterious pseudogap. This Review…
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Electronic structure of the parent compound of superconducting infinite-layer nickelates
TLDR
X-ray spectroscopy and density functional theory are used to show that the electronic structure of the parent compound of superconducting infinite-layer nickelates, while similar to the copper-based high-temperature superconductors, has significant differences.
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Distinct Fermi-Momentum-Dependent Energy Gaps in Deeply Underdoped Bi2212
TLDR
A two-gap scenario in momentum space is proposed that is consistent with other experiments and may contain important information on the mechanism of high–transition temperature superconductivity.
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From a Single-Band Metal to a High-Temperature Superconductor via Two Thermal Phase Transitions
TLDR
Upon further cooling, spectroscopic signatures of superconductivity begin to grow close to the superconducting transition temperature (Tc), entangled in an energy-momentum–dependent manner with the preexisting pseudogap features, ushering in a ground state with coexisting orders.
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