ELFT HÍRADÓ

[Janos Asboth <asboth.janos AT wigner.mta.hu>]

Meghívó

BME Elméleti Fizika Szeminárium,

október 25. péntek 10h15,

1111 Budapest, Budafoki út 8., BME F III. magasföldszint 01.,
Elméleti Fizika Tanszék szemináriumi szoba

Balla Péter (Wigner FK SZFI):

Spin Spiral Surfaces in Heisenberg Magnets
Explicit constructions of models with ground state degeneracy

Frustration in classical spin models can lead to degenerate ground states
without long-range order. In reciprocal space, these degeneracies appear as
manifolds of wave vectors, their dimensionality increasing with the degree
of frustration and the robustness of the disordered spin-liquid state.
Here, we present a recipe to explicitly construct Heisenberg models on
Bravais lattices with codimension-one manifolds, i.e., lines in two
dimensions and surfaces with different Euler characteristics in three
dimensions. Furthermore, we discuss the role of thermal and quantum
fluctuations in stabilizing ordered states.

based on:
P Balla, Y Iqbal, K Penc, Phys. Rev. B 100, 140402(R) (2019)

Minden érdeklődőt szeretettel várunk.

Asbóth János
szemináriumi koordinátor