Fig. 1
From: Photoinduced possible superconducting state with long-lived disproportionate band filling in FeSe
Schematics and conventional angle-resolved photoelectron spectroscopy (ARPES). a Schematics of time- and angle-resolved photoemission spectroscopy (TARPES) for FeSe. An infrared (IR) pulse of 1.55 eV is used for the pump, and an extreme ultraviolet (XUV) pulse of 27.9 eV by high harmonic generation from Ar gas is used for the probe to cover a large area including the M point. b Fermi surface mapping of FeSe. The intensity is mapped onto the in-plane electron momentum (kx, ky). Orange and green lines represent measured cuts at the Γ and M points for the TARPES measurements, respectively. Black dashed lines indicate the Brillouin zone boundary. c, d Band dispersions at the Γ and M points along the momentums shown in (b). The vertical axes are represented as electron energies (E) with respect to the Fermi levels (EF). Spectra in b–d were measured by a He-discharge lamp at 21.2 eV
