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Scheda Riassuntiva
Anno Accademico 2015/2016
Scuola Scuola di Ingegneria Industriale e dell'Informazione
Insegnamento 096058 - PHYSICS OF LOW DIMENSIONAL SYSTEMS [I.C.]
Docente Finazzi Marco , Ghiringhelli Giacomo Claudio
Cfu 10.00 Tipo insegnamento Corso Integrato

Corso di Studi Codice Piano di Studio preventivamente approvato Da (compreso) A (escluso) Insegnamento
Ing Ind - Inf (Mag.)(ord. 270) - BV (478) NUCLEAR ENGINEERING - INGEGNERIA NUCLEARE*AZZZZ096058 - PHYSICS OF LOW DIMENSIONAL SYSTEMS [I.C.]
096075 - THIN FILMS: MAGNETISM AND SUPERCONDUCTIVITY
Ing Ind - Inf (Mag.)(ord. 270) - MI (486) ENGINEERING PHYSICS - INGEGNERIA FISICA*AZZZZ096058 - PHYSICS OF LOW DIMENSIONAL SYSTEMS [I.C.]
096511 - PHYSICS OF SURFACES
096075 - THIN FILMS: MAGNETISM AND SUPERCONDUCTIVITY
Ing Ind - Inf (Mag.)(ord. 270) - MI (491) MATERIALS ENGINEERING AND NANOTECHNOLOGY - INGEGNERIA DEI MATERIALI E DELLE NANOTECNOLOGIE*AZZZZ096075 - THIN FILMS: MAGNETISM AND SUPERCONDUCTIVITY

Programma dettagliato e risultati di apprendimento attesi

Physics of Surfaces

 

Objectives

The aim of the course is to illustrate the morphologic, electronic ad optical properties developed by surfaces and interfaces of crystalline solids. Surfaces and interfaces represent examples of low-dimensional systems, where the symmetry reduction may induce novel and exotic properties with respect to those that can be observed inside the bulk of a solid. The physical mechanisms acting inside the bulk or at the surface of a solid will be compared in order to highlight their role in defining how the electronic and optical properties of solid matter are influenced by symmetry reduction. During the course the students will be also introduced to a few experimental techniques that are currently employed in modern Surface Science.

Syllabus

Band structure.

Examples of simple metals, 3d metals and insulators. Nearly free electron model and tight binding approximation.

Density of states: examples in 1, 2 and 3 dimensions.

Surface electronic states: projected bands structure, Shockley states, Tamm states.

Beyond the single particle approximation: Anderson and Hubbard models.

Selected examples: graphene, topological insulators, …

Optical properties.

Kramers-Kronig  relations. Direct and indirect  transitions. Joint density of states in 1, 2 and 3 dimensions.

Excitons and plasmons. Surface plasmons and  plasmonics.

Experimental techniques.

                Surface preparations and thin film growth.

                Structural characterization of surfaces: LEED.

                Electronic structure determination: photoemission (UPS, XPS, ARPES), Auger spectroscopy, microscopy

 

BIBLIOGRAPHY:

Ashcroft-Mermin “Solid State Physics”, Luth “Solid surfaces, Interfaces and Thin Films”, (Hofmann “Solid state physics”, M. Fox “Optical properties of solids”)

 

Thin films: Magnetism and Superconductivity

 

Objectives

The course presents two important phenomena that are strongly influenced by dimensionality: magnetic order and superconductivity. Both subjects are presented at a general level in solids and discussed for their modifications in thin films, at interfaces and in solids characterized by an intrinsic reduced dimensional (2D or 1D) structure. Some experimental technique for the exploration of relevant magnetic and electronic properties are also described. The aim is to broaden the knowledge of important ordering phenomena in solids and to underline how dimensionality may alter them.

 

Syllabus

Magnetism of isolated magnetic moments

Phenomenology: recalling diamagnetism, paramagnetism and atomic moments.

Crystal field: origin of CF, quenching of orbital moments, Jahn-Teller effect.

Exchange interaction.

Magnetic order and magnetic structures.

Heisenberg and Ising models.

Magnetism in metals

 Pauli paramagnetism, Landau diamagnetism, Stoner model, RKKY interaction.

Excitations in magnetic systems.

                Spin waves, Stoner excitations

Magnetism at low dimensionality.

Spin chains and spin ladders, 2 dimensional magnets, thin films.

Superconductivity: phenomenology, London equations, Josephson effect, BCS theory, Cuprate superconductors (also as an example of 2D antiferromagnets).

Experimental techniques.

                Magnetic resonances, Mössbauer spectroscopy.

                Elastic and inelastic scattering for magnetic structure and magnetic excitations.

                Magneto-optical techniques.

 

Bibliography

S. Blundell “Magnetismm in condensed matter”, Oxford University Press

Ashcroft-Mermin “Solid State Physics”, Saunders College.

 

Prerequisites

Bachelor courses on Quantum physics, Structure of matter and Mathematics. Master course in Solid state physics.

 

 


Note Sulla Modalità di valutazione

Thin films: Magnetism and Superconductivity

The exam consists of a short seminar followed by an oral interview.

Physics of Surfaces

Oral examination.

 


Bibliografia

Mix Forme Didattiche
Tipo Forma Didattica Ore didattiche
lezione
64.0
esercitazione
32.0
laboratorio informatico
0.0
laboratorio sperimentale
0.0
progetto
0.0
laboratorio di progetto
0.0

Informazioni in lingua inglese a supporto dell'internazionalizzazione
Insegnamento erogato in lingua Inglese
schedaincarico v. 1.6.5 / 1.6.5
Area Servizi ICT
30/11/2020