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

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

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.