MtPh

Resonating valence bonds and spinon superfluidity in a cavity

date
18.05.2018 
time
10:30 AM - 11:30 AM 
speaker
Dr. Ganesh Ramachandran 
affiliation
The Institute of Mathematical Sciences, Chennai, India 
language
en 
main topic
Materials: Superconductors, Magnetic Materials, Nano Structures
subtopics
Physics: Condensed Matter (incl. Soft, Solid)
host
Grit Rötzer 
abstract

Resonating valence bond (RVB) states are a class of quantum many-body wavefunctions that were first studied in organic chemistry. They play a key role in modern condensed physics as the source of ideas such as topological order. We propose a scheme to synthesize RVB states in cavity-based experiments using the notion of wavefunction collapse. We consider a cavity QED setup with two-level atoms coupled to a common photon mode. In the lossy cavity limit, this can be configured as a Stern-Gerlach experiment wherein the emission of photons is measured. This collapses the wavefunction of the two-level atoms onto a class of RVB states. We show that this naturally gives rise to a superconductor-like phase with Cooper-like pairs of `spinons’ (unpaired spins). We also demonstrate an elegant quantum phase transition from `darkness’ (trapping of photons within the cavity due to quantum interference) to `light’ (emission of photons from the cavity).
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Last update: 18.05.2018 07:37.

venue 

Leibniz Institut für Festkörper- und Werkstoffforschung Dresden (D2E.27, IFW Dresden) 
Helmholtzstraße 20
01069 Dresden
homepage
http://www.ifw-dresden.de 

organizer 

Leibniz Institut für Festkörper- und Werkstoffforschung Dresden (IFW)
Helmholtzstraße 20
01069 Dresden
homepage
http://www.ifw-dresden.de 
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