The quantum spin quadrumer
- Date
- Sep 15, 2017
- Time
- 10:30 AM - 11:30 AM
- Speaker
- Dr. Ganesh Ramachandran
- Affiliation
- The Institute of Mathematical Sciences, Chennai, India
- Language
- en
- Main Topic
- Materialien
- Other Topics
- Materialien, Physik
- Host
- Grit Rötzer
- Description
- A fundamental motif in frustrated magnetism is the N-spin cluster with the Hamiltonian $H = vec{S}_{tot}^2$, where $vec{S}_{tot}$ is the sum of all the N spins. Examples include (N=2) dimerized systems, (N=3) Kagome antiferromagnets and (N=4) spin ice systems. For N=2,3, such systems have been fruitfully studied using semi-classical large-S field theories. We present the appropriate theory for the N=4 case. Unlike N=2 and 3, the N=4 cluster has rich topological features. In particular, its ground state space has non-manifold character with extra soft modes appearing at isolated points. We show that in the low-energy limit, the N=4 cluster decouples into a free spin-S spin and a rigid rotor. This provides an elegant way to understand its spectrum and physical properties.
- Links
Last modified: Sep 15, 2017, 9:59:26 AM
Location
Leibniz Institut für Festkörper- und Werkstoffforschung Dresden (A2E.30, IFW Dresden)Helmholtzstraße2001069Dresden
- Homepage
- http://www.ifw-dresden.de
Organizer
Leibniz Institut für Festkörper- und Werkstoffforschung DresdenHelmholtzstraße2001069Dresden
- Homepage
- http://www.ifw-dresden.de
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