project, your goal will be to model existing neutron scattering data on the magnetic
dynamics (so-called spin waves or magnons) of the honeycomb lattice antiferromagnetic
this task, you must first get comfortable with the concept of a spin wave or magnon
dispersion relation (Chapter 12 in Ref.  is a good starting point) and reach
an understanding of how a dispersion relation is calculated by the matlab code spinw. Once you have reached this stage, the next
step is to start from the known zigzag
magnetic structure of Na2Co2TeO6 (See Figure), and then determine the
expected magnetic excitation spectrum for given combinations of nearest,
next-nearest, and third-nearest exchange interactions (See chapter 12 in Ref. ).
Finally, using simple Monte Carlo simulations to perform a powder average, you
should compare your theoretical spin wave spectrum to the experimental data
(See Figure), and determine the unknown exchange interactions by finding the
project is suitable as a bachelor project, but could – in modified form – also
be taken as a special course or a master thesis. He project will teach you a
lot about magnetism as well as important data analysis techniques.
Useful literature: . C. Kittel, Introduction to Solid State Physics,
Wiley (2005);  L. Viciu, Q. Huang, E. Morosan, H. W. Sandbergen, N. I
Greenbaum, T. McQueen and R. J. Cava, J. Solid State Chem. 180, 1060 (2008);  A. K.
Bera, S. M. Yusuf, A. Kumar, C. Ritter, Phys. Rev. B 95, 094424 (2017);  https://www.psi.ch/spinw/
Quantum mechanics and condensed matter physics (For example, the courses 10102 and 10303). Preferably, you should also have a working knowledge of matlab at the start of the project.