# 138.121 Concepts in Condensed Matter Physics Diese Lehrveranstaltung ist in allen zugeordneten Curricula Teil der STEOP.\$(function(){PrimeFaces.cw("Tooltip","widget_j_id_21",{id:"j_id_21",showEffect:"fade",hideEffect:"fade",target:"isAllSteop"});});Diese Lehrveranstaltung ist in mindestens einem zugeordneten Curriculum Teil der STEOP.\$(function(){PrimeFaces.cw("Tooltip","widget_j_id_23",{id:"j_id_23",showEffect:"fade",hideEffect:"fade",target:"isAnySteop"});});

2019W, VU, 2.0h, 3.0EC

## Merkmale

• Semesterwochenstunden: 2.0
• ECTS: 3.0
• Typ: VU Vorlesung mit Übung

## Lernergebnisse

Nach positiver Absolvierung der Lehrveranstaltung sind Studierende in der Lage...

1) Identify relevant mathematical structures and concepts in condensed matter problems, e.g. eivenvectors, eigenvalues and other linear algebra structures, correlation functions, inital value and boundary value problem of differential equations, Fourier transform.

2) Use discrete and continuous symmetries to assess the correctness of numerical results and to simplify physical problems

3) Construct Fock space of fermionic problems and apply it to simple systems with few degrees of freedom

4) Use Fourier transforms both in space and time/frequency domain

5) Understand basic approximations use in condensed matter physics, e.g. strong and weak coupling expansion, large-N expansion, embedding, stochastic simulations

6) Calculate magnetic susceptibility of 6-site Hubbard molecule as a function of temperature

## Inhalt der Lehrveranstaltung

Foundations of quantum theory: causal evolution and measurement, observables, wavefunctions, Hermitean operators, evolution operator and Hamiltonian

Schrodinger equation, stationary states, time evolution, Hemitean and unitary operators

Basic statistical physics, Boltzmann factor

Symmetry and eigenvalue degeneracy

Quantum theory of many particles: fermions and bosons, Pauli principle, commutation relations, Pauli principle

Lattice models, translational symmetry

Exact diagonalization, construction of Fock space and fermionic operators

Correlation functions and linear response to external perturbations

Non-interacting electrons in periodic solids, Bloch theorem

There will be a pilot problem, to which we apply the studied concepts, a 6-atomic cyclic molecule.

## Methoden

Interaktive Abwicklung der Lehrveranstaltung

Mündlich

## Weitere Informationen

The lectures will take place on Mondays 13:00-15:00 in room Sem.R. DB gelb 09

The 'Vorbesprechung' will take place on October 7, 13:00 in Sem.R. DB gelb 09

"Anmeldung" is required!

## Leistungsnachweis

Presentation of simple numerical project and discussion of corresponding methods and physical concepts

## LVA-Anmeldung

Von Bis Abmeldung bis
24.09.2019 12:00 07.10.2019 12:00 14.10.2019 12:00

## Curricula

StudienkennzahlSemesterAnm.Bed.Info
066 646 Computational Science and Engineering

## Literatur

Es wird kein Skriptum zur Lehrveranstaltung angeboten.

Englisch