Magnetic properties and fine analysis of low dimensional matter

A.Y. 2018/2019
6
Max ECTS
42
Overall hours
SSD
FIS/03
Language
Italian
Learning objectives
The course provides an introduction to

i) ferromagnetism in solids, surfaces and nanostructured matter

ii) methods and experiments of Fine Analysis of matter based on the use of electron beams, photon beams (UV and X) from Synchrotron and Free Electron Laser sources, and neutron beams

iii) static and dynamical properties of matter at low dimensions in particular, magnetism, superconductivity, topological properties, orbital ordering and spin.
Expected learning outcomes
Undefined
Course syllabus and organization

Single session

Responsible
Lesson period
First semester
Course syllabus
SURFACE PHYSICS - MOD 2
1) Introduction to the course, surface problem, total energy minimization for a finite, surface-terminated solid.
2) Principles for measuring reflectivity, diffraction, absorption, and decay. Understanding experimental geometries with external sources.
3) Ultra-high vacuum, mean free path calculation for low-pressure molecules, UHV production technologies and pressure measurements in UHV.
4) Surface phenomenology: surface melting, melting and non-melting surfaces.
Proton channeling experiments (van der Veen) and theoretical predictions (Tosatti)
5) Molecular beam Epitaxy, 2D growth models, monitoring growth by grazing electron diffraction (RHEED).
6) Ion scattering, SIMS and RBS, FIM, SEM, SEXAFS
7) Scanning Tunnelling Microscopy. Surface morphological investigation in real space.
8) Scanning Tunnelling Spectroscopy. Local spectroscopy . Examples, surface chemical waves.
9) Atomic Force Microscopy, theory and examples, other Scanning Probes
10) Quantons-matter interaction, absorption and diffusion cross sections
11) Optical theorem and experimental techniques with X-ray sources, electrons, neutrons, structural investigation methods in the reciprocal space, EXAFS
12) Surface diffusion and diffraction, kinematic approximation. Examples.
13) Surface diffraction, phase problem, Patterson method, experimental methods and experimental geometries.
14) Coherent imaging of nanostructures
15) X-ray absorption as spectroscopy of unoccupied levels, XMCD as magnetometry, sum rules, XMLD, other geometries.
16) Inner levels photoemission, chemical shifts, surface core level shifts
17) Auger Spectroscopy (AES)
18) Angle and Spin-resolved photoemission (ARPES, SP-ARPES). Three-steps model, independent electrons model, experimental geometry, matrix elements, symmetries. Surface states of Copper. Image states, two-photon photoemission. EELS and HREELS. Planare and specular scattering. Surface plasmons.
19) ARPES: manybody interpretation, surface metal-insulator transition.
20) Magnetism in materials
21) Surface magnetism, magnetic ordering at surfaces, spind and orbital magnetic moment
22) Magnons, spin deviations, measurement techniques, spin transport, Mott scattering, Kerr and XMCD effects. Measuring photoelectron spin.
23) Dynamical phenomena at surfaces, time-resolved measurements, pump-probe experiments
24) Surface phonons. Raman and Brillouin scattering.
25) Visit to the Trieste Elettra Synchrotron, and to NFFA-APE (growth, characterization, ARPES and XMCD, MOKE).
26) Visit to the Trieste Free Electron Laser (FEL) FERMI@Elettra, and to NFFA-SPRINT (pump-probe photoemission with pulsed laser).
FIS/03 - PHYSICS OF MATTER - University credits: 6
Lessons: 42 hours
Professor: Rossi Giorgio
Professor(s)
Reception:
upon reservation, via e-mail
on line, via ZOOM