High-resolution angle-resolved photoemission spectroscopy and microscopy

Abstract

This review outlines fundamental principles, instrumentation, and capabilities of angle-resolved photoemission spectroscopy (ARPES) and microscopy. We will present how high-resolution ARPES enables to investigate fine structures of electronic band dispersions, Fermi surfaces, gap structures, and many-body interactions, and how angle-resolved photoemission microscopy (spatially-resolved ARPES) utilizing micro/nano-focused light allows to extract spatially localized electronic information at small dimensions. This work is focused on specific results obtained by the author from strongly correlated copper and ruthenium oxides, to help readers to understand consistently how these techniques can provide essential electronic information of materials, which can, in principle, apply to a wide variety of systems.

Electron-magnon coupling and quasiparticle lifetimes on the surface of a topological insulator

“…We have thus far considered material parameters relevant for the theoretical calculations in Ref. [6], and shown that the assumption of low renormalization of the fermionic state makes sense, at least at a low temperature of T = 10 −7 eV, corresponding to T ≈ 10 −3 K. ARPES experiments are however typically performed at significantly higher temperatures [41][42][43][44][45][46][47]. We choose T = 2.2 meV, corresponding to T ≈ 25 K, as a temperature which is readily achievable experimentally.…”

“…Each set of figures is then convolved with two different sets of assumed energy, E, and momentum, k, resolutions. The upper panels include state-of-the-art, synchrotron ARPES resolutions (∆E = 1 meV, ∆k = 0.005 Å−1 ) [43][44][45]. The lower panels include good lab-based resolutions, (i.e.…”

A narrow bandwidth extreme ultra-violet light source for time- and angle-resolved photoemission spectroscopy

“…Over the past decades, there have been great improvements in synchrotron-based light sources which, together with new and more versatile electron analyzers, have pushed the energy and momentum-space resolutions in ARPES experiments to unprecedented levels. 4,5 In parallel to this development, ARPES has taken a leap into the time-domain due to the advent of femtosecond high-power lasers that have enabled ultrafast extreme-ultraviolet (XUV) light sources based on high-harmonic generation (HHG) in noble gases 6–10 or non-linear crystals. 11–14 While several successful implementations of time- and angle-resolved photoemission spectroscopy (tr-ARPES) systems have been demonstrated, the technique continues to rapidly evolve and there is still much progress to be made in terms of increased repetition rate, photon flux, improved time and energy resolutions, and photon energy and momentum range coverage, as well as pump versatility.…”

A narrow bandwidth extreme ultra-violet light source for time- and angle-resolved photoemission spectroscopy

“…Over the past decades, there have been great improvements in synchrotron-based light sources which, together with new and more versatile electron analyzers, have pushed the energy and momentum-space resolutions in ARPES experiments to ever increasing levels 4,5 . In parallel to this development, ARPES has taken a leap into the time-domain due to the advent of femtosecond high-power lasers that have enabled ultrafast extreme-ultraviolet (XUV) light sources based on high-harmonic generation (HHG) in noble gases [6][7][8][9] or nonlinear crystals [10][11][12] .…”