Berlin 2018 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 72: Poster Session: Correlated Electrons

TT 72.7: Poster

Mittwoch, 14. März 2018, 15:00–19:00, Poster B

Slave Boson Mean Field - revisited — •Jannis Seufert, David Riegler, Michael Klett, and Ronny Thomale — Institute for Theoretical Physics, University of Würzburg, Germany

Considering correlated electron systems where interactions constitute the dominant energy scale is a challenging problem in solid state physics. The Slave-boson mean field method provides an exact mapping of fermionic Hamiltonians into a description, where the interaction terms become bilinear in bosonic auxiliary fields, whereas terms which are bilinear in the original Hamiltonian transform to a mix of auxiliary bosonic and fermionic fields. A consecutive mean field treatment is therefore especially suitable to incorporate the impact of strong interactions, and yields a non-interacting effective band structure. Experimentally relevant quantities such as heat capacity or effective mass can be derived from the mean field variables, while dynamic quantities such as susceptibilities can be obtained from fluctuations around the saddle point. Evaluating susceptibilities allows to obtain phase diagrams, especially talking incommensurate magnetism by means of a magnetic, momentum dependent mean field into account. We provide a fresh look on the method of spin rotation invariant Slave-boson mean field with fluctuations around the saddle point, and its applications to investigate incommensurate magnetism and heavy fermion systems.