# Minicurso de ARPES com o prof. Claude Monney - Université de Fribourg

Minicurso de ARPES com o prof. Claude Monney - Université de Fribourg

https://sites.google.com/sportfan.ch/group-cmonney/home

Aulas das 10 as 12 (sala 2003) e das 14 as 16 (sala 2009).

Programa do minicurso.

Monday June 24:

Basics of ARPES: The first lecture of the week is devoted to the

basics of angle-resolved photoemission spectroscopy (ARPES), which is

the most employed technique to access the momentum-resolved electronic

structure of materials. We will learn how the photoelectric effect is

used to perform photoemission spectroscopy. We will also learn how to

take advantage of the conservation of momentum to perform ARPES.

Tuesday June 25:

The spectral function in ARPES: This lecture will introduce the

concept of the spectral function in photoemission. We will learn under

which conditions we can model photoemission with the spectral function

and will derive together relevant formulas. We will then see what

information about many body physics is encoded in the spectral function.

Wednesday June 26:

The spectral function in ARPES 2: This lecture is a follow-up of the

previous one. We will study famous examples from the scientific

literature to illustrate how ARPES can access many body effects in

correlated materials and how it can be modelled through the spectral

function. Typically we will discuss together the effect of

electron-phonon coupling or electron-electron interactions in ARPES.

Thursday June 27:

Basics of RIXS: This lecture is devoted to the basics of resonant

inelastic x-ray scattering (RIXS). RIXS is a powerful and versatile

x-ray spectroscopy. We will derive together the Kramers-Heisenberg

formula describing RIXS using second-order perturbation theory. We

will then discuss how a RIXS experiment is planned in practice, taking

advantage of the absorption edge of relevant ions in materials and of

the scattering geometry.

Friday June 28:

RIXS on correlated materials: In the last 10 years, the development of

the RIXS technique and its application to correlated materials

followed a steady and impressive development. We will illustrate this

with examples from the scientific literature and discuss them in

details. We show how RIXS can measure crystal field excitations,

magnetic excitations or interband electron-hole excitations. We will

discuss how one can take advantage of the RIXS cross-section to

discriminate between these different excitations.