Project

Schwinger bosons for magnetism

Publisher

Supervisor

Location

Greater Copenhagen area

Magnetic order arises from interactions between electronic spins. This introduces correlation in the quantum mechanical wavefunction, which renders a theoretical description highly challenging. One tyically resorts to the Heisenberg model, which captures the essential physics, but even that model cannot be solved without certain approximations.

Very recently, it was demonstrated that the two-dimensional material CrI3 exhibits magnetic order below 45 K. This is the first example ever of a magnetic 2D material and the microscopic mechanism that is responsible for magnetic order is linked to the magnetic anisotropy in the material.

In the present project we will study the 2D Heisenberg model with anisotropy relevant for CrI3. We combine quantum mechanical calculations with statistical physics to obtain a theoretical estimate of the critical temperature. In particular, we will use the method of Schwinger bosons that maps the spin operators on to a set of bosonic operators that create and anihilate spin exciations. The resulting equations can be handled in a mean field framework if a holonomic constraint on the operators is included.

Requirements

Electronic structure methods in solid state physics

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Contact

Company / Organization

DTU Fysik

Name

Thomas Olsen

Position

Lektor

Mail

tolsen@fysik.dtu.dk

Supervisor info

BSc in Physics and Nanotechnology

Supervisor

Thomas Olsen

ECTS credits

15 - 20

Type

BSc project

MSc in Physics and Nanotechnology

Supervisor

Thomas Olsen

ECTS credits

15 - 20

Type

BSc project

Technical University of Denmark

For almost two centuries DTU, Technical University of Denmark, has been dedicated to fulfilling the vision of H.C. Ørsted – the father of electromagnetism – who founded the university in 1829 to develop and create value using the natural sciences and the technical sciences to benefit society.


Today, DTU is ranked as one of the foremost technical universities in Europe, continues to set new records in the number of publications, and persistently increases and develops our partnerships with industry, and assignments accomplished by DTU’s public sector consultancy.

Find us here

Anker Engelunds Vej 1
Bygning 101A
2800 Kgs. Lyngby

Denmark



Tlf. (+45) 45 25 25 25

CVR-nr. 30 06 09 46

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