Dresden 2020 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 65: Poster Session Topological Topics

TT 65.32: Poster

Thursday, March 19, 2020, 15:00–19:00, P2/EG

Linked cluster expansions for non-Hermitian quantum spin systems — •Lea Lenke and Kai Phillip Schmidt — Chair for Theoretical Physics I, FAU Erlangen-Nürnberg, Germany

In quantum mechanics, the standard axiom of Hermitian Hamiltonians can be replaced by the axiom of PT-symmetric Hamiltonians without automatically loosing the realness of the energy spectrum. The properties of PT-symmetric quantum mechanics is investigated by applying the formalism of linked cluster expansions to the exactly solvable Ising chain in a complex transverse magnetic field. In a next step the gained experience will be used to study topological phase transitions in Kitaev's toric code in a magnetic field.