Gruppenseminar
Das Seminar unserer Gruppe findet jeden Montag innerhalb des Semesters 11:15 Uhr im Raum 1.0.1.0 in der Karl-Freiherr-von-Fritsch Str. 3 statt.
| Date | Speaker | |
|---|---|---|
| October 12th Time: 16:00 | Dr. Michael Sekania | guest speaker |
| October 19th | Levan Chotorlishvili | seminar or chat |
| October 26th | Conrad Schuster | seminar or chat |
| November 2nd | Seyyed Ruhollah Etesami | seminar or chat |
| November 9th | Bahman Roostaei | guest speaker |
| November 16th | Yaroslav Pavlyukh | seminar or chat |
| November 23th | Jamal Berakdar | seminar or chat |
| November 30th | Michael Schüler | seminar or chat |
| December 7th | TBA | guest speaker |
| December 14th | Alexander Sukhov | seminar or chat |
| January 11th | Maryam Azimi | seminar or chat |
| January 18th | Stefan Stagraczyński | seminar or chat |
| January 25th | Jonas Wätzel | seminar or chat |
Dr. Michael Sekania
Institut für Physik
Universität Augsburg
msakenia@physik.uni-augsburg.de
Revealing "string states" in the Hubbard chain using quench dynamics
Recently, spin-imbalanced fermions in one dimension have attracted considerable attention both theoretically and experimentally. This system was successfully simulated using ultracold atoms in optical lattices. The phase diagram was measured and found to be in agreement with exact analytical calculations. It has been also theoretically predicted that the spin-charge separation, an important property of Luttinger liquids, is absent in spin imbalanced fermion systems.
Based on our numerical (time-dependent Density-Matrix Renormalization Group method) and analytical calculations (Bethe Ansatz) for the Hubbard model, we propose quench experiments which not only reveal the breakdown of spin-charge separation, but also make it possible to study the so called ”string” bound states in this system.
Bahman Roostaei
Dynamics of Domain Walls in Helical Magnetic Systems
Observation of helical domains in certain metallic magnetic systems introduces a new class of domain walls rarely studied in the past. There are at least two general types of domain walls separating helical domains: vortex walls and Hubert walls, both behaving fundamentally different compared to conventional domain walls such as Bloch walls. One of the many interesting features of such structures is their topological nature. We study the elasticity, pinning and also interaction of these walls with spin polarized current.