Speaker
-
BERGHOLTZ
Emil J. BERGHOLTZ “Exceptional Topology of Non-Hermitian Systems”
Emil J. Bergholtz, Department of Physics, Stockholm University
Non-Hermitian “Hamiltonians” have become an important asset for the effective description of various physical systems that are subject to dissipation. Using simple examples, I will discuss several new topological phenomena and relate them to the exclusively non-Hermitian concept of exceptional degeneracies at which both eigenvalues and eigenvectors coalesce.
I will also discuss how the bulk-boundary correspondence is modified in non-Hermitian systems and how this might be harnessed in novel sensor devices.
[1] E.J. Bergholtz et al., Rev. Mod. Phys. 93, 015005 (2021).
[2] J.C. Budich and E.J. Bergholtz, Phys. Rev. Lett. 125, 180403 (2020).
