By Junfeng He
This booklet usually specializes in the examine of the high-temperature superconductor Bi2Sr2CaCu2O8+δ (Bi2212) and single-layer FeSe movie grown on SrTiO3 (STO) substrate via angle-resolved photoemission spectroscopy (ARPES). It presents the 1st digital facts for the foundation of the anomalous high-temperature superconductivity in single-layer FeSe grown on SrTiO3 substrate. coexisted sharp-mode couplings were pointed out in superconducting Bi2212. the 1st ARPES examine on single-layer FeSe/STO motion pictures has supplied key insights into the digital starting place of superconductivity during this method. A section diagram and digital indication of excessive Tc and insulator to superconductor crossover were confirmed within the single-layer FeSe/STO motion pictures. Readers will locate crucial details at the innovations used and fascinating actual phenomena saw through ARPES.
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Extra info for Angle-Resolved Photoemission Spectroscopy on High-Temperature Superconductors: Studies of Bi2212 and Single-Layer FeSe Film Grown on SrTiO3 Substrate
4 Determination of K z in 3D Systems [2, 15] ARPES is broadly used to study 2D systems. Due to the breaking of momentum conservation along the sample surface normal, the measurement of K z in 3D materials is not as straightforward as that of the in-plane momenta. K i,z of the initial state is not given by K out,z directly. However, we are still able to get the information of K i,z under some simple assumptions. Let us first consider the excited electrons after step one in the three-step model. Being ejected to the final states, those electrons can be assumed as quasi-free electrons and thus be described as: Ef = 2 2m e (K 2f,x + K 2f,y + K 2f,z ) + E 0 .
18) in which A is an antisymmetric operator, φ kf is the wave function of the photoelectron, and Ψ fN −1 is the final state wave function of the (N-1)-electron system which can be written as an eigenstate ΨmN −1 with energy E mN −1 . Then, the total transition probability can be estimated by summing over m. This is called “sudden approximation” in which the photoemission process is assumed to be sudden . This approximation works good for photoelectrons with high kinetic energy. However, if the kinetic energy of the photoelectron is very low that the time it takes to escape is comparable to the system response time, then the transition process cannot be regarded as sudden and the sudden approximation cannot be used any more.
Shown in Fig. 5 is the ultraviolet laser-based ARPES system developed in our laboratory. The details of the system and the related testing results will be presented below. 1 Energy Resolution of the System  The direct way to calibrate the energy resolution of the system is to measure the Fermi edge of clean polycrystalline gold at low temperature. The overall width of the measured Fermi edge is composed of three main contributions: 1. energy resolution of the system, 2. temperature broadening, and 3.
Angle-Resolved Photoemission Spectroscopy on High-Temperature Superconductors: Studies of Bi2212 and Single-Layer FeSe Film Grown on SrTiO3 Substrate by Junfeng He