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Seminar TPII/III EPVI


24.10.2017 16:00, Raum: S-288
Prof. Dr. Stefan Kirchner (Center for Correlated Matter, Zhejiang, University, Hangzhou, China)
Transport anomalies in ZrAs1.58Se0.39: Vacancies in the PbFCl structure as a route to two-channel Kondo physics
14.11.2017 16:00, Raum: S-288
Dr. Martin Hohenadler (Universität Würzburg)
Competing Orders in Luttinger and Dirac Liquids
28.11.2017 17:00, Raum: S-288
Prof. Dr. Björn Trauzettel (Universität Würzburg)
Chiral anomaly and fractional charges at the quantum spin Hall edge

The chiral anomaly is based on a non-conserved chiral charge and can happen in Dirac fermion systems under the influence of external electromagnetic fields. In this case, the spectral flow leads to a transfer of right- to left-moving excitations or vice versa. The corresponding transfer of chiral particles happens in momentum space. We here describe an intriguing way to introduce the chiral anomaly into real space. Our system consists of two quantum dots that are formed at the helical edges of a quantum spin Hall insulator by means of magnetic barriers. Such a setup gives rise to fractional charges which we show to be sharp quantum numbers for large barrier strength. Interestingly, it is possible to map the system onto a quantum spin Hall ring in the presence of a flux pierced through the ring where the relative angle between the magnetization directions of the barriers takes the role of the flux. The chiral anomaly in this system is then directly related to the excess occupation of particles in the two quantum dots. This analogy allows us to predict an observable consequence of the chiral anomaly in real space.

12.12.2017 16:00, Raum: S-288
Eugene Kogan (Bar Ilan University)
Spin-anisotropic magnetic impurity in a Fermi gas: Integration of poor man's scaling equations
9.1.2018 16:00, Raum: S-288
Prof. Dr. Raymond Frésard (Normandie Université, ENSICAEN, UNICAEN, CNRS, CRISMAT, Caen)
Charge excitation spectra of the two-dimensional extended Hubbard Model: collective modes and continuum
23.1.2018 16:00, Raum: S-288
Dr. Achilleas Lazarides (Max-Planck-Institut für die Physik komplexer Systeme, Dresden)
Thema wird noch bekannt gegeben
6.2.2018 16:00, Raum: S-288
Prof. Dr. Malte A. Peter (Institut für Mathematik, Angewandte Analysis, Universität Augsburg)
Localisation of classical waves in some disordered media