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12 items found (0 items not approved), displaying 11 to 12.[First/Prev] 1, 2 [Next/Last]

Instruments / Technical Area	Publication Details	Published	Actions
	Shifts and splittings of the hole bands in the nematic phase of FeSe Matthew Watson , Amir A. Haghighirad , Hitoshi Takita , Wumiti Mansuer , Hideaki Iwasawa , Eike F. Schwier , Akihiro Ino , Moritz Hoesch Journal Of The Physical Society Of Japan 86 DOI: 10.7566/JPSJ.86.053703 Open Access Show Abstract ▼ Abstract: We report a high-resolution laser-based angle-resolved photoemission spectroscopy (laser-ARPES) study of single crystals of FeSe, focusing on the temperature-dependence of the hole-like bands around the Γ point. As the system cools through the tetragonal–orthorhombic “nematic” structural transition at 90 K, the splitting of the dxz/dyz bands is observed to increase by a magnitude of 13 meV. Moreover, the onset of a ∼10 meV downward shift of the dxy band is also observed at 90 K. These measurements provide clarity on the nature, magnitude and temperature-dependence of the band shifts at the Γ point in the nematic phase of FeSe.	May 2017
I05-ARPES	Multiband one-dimensional electronic structure and spectroscopic signature of tomonaga-luttinger liquid behavior in K2Cr3As3 Matthew D. Watson , Yu Feng , Christopher Nicholson , Claude Monney , Jonathon Riley , Hideaki Iwasawa , Keith Refson , Vincent Sacksteder , Devashibhai Adroja , Jun Zhao , Moritz Hoesch Physical Review Letters 118, 097002 DOI: 10.1103/PhysRevLett.118.097002 Diamond Proposal Number(s): [13797, 14572] Open Access Show Abstract ▼ Abstract: We present angle-resolved photoemission spectroscopy measurements of the quasi-one-dimensional superconductor K2Cr3As3. We find that the Fermi surface contains two Fermi surface sheets, with linearly dispersing bands not displaying any significant band renormalizations. The one-dimensional band dispersions display a suppression of spectral intensity approaching the Fermi level according to a linear power law, over an energy range of ∼200 meV. This is interpreted as a signature of Tomonoga-Luttinger liquid physics, which provides a new perspective on the possibly unconventional superconductivity in this family of compounds.	Mar 2017

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