Theory of fractionalized topological phases (A04)

• Subject Area: Theoretical Condensed Matter Physics
• Term: since 2016
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 277101999

Project A04 focuses on topological phases that exhibit fractionalization -- the emergence of quasiparticles with microscopically forbidden quantum numbers, such as charge-neutral spin-1/2 `spinons' in quantum magnets. It combines a variety of analytical and numerical techniques to study gapless quantum spin liquids and correlated insulators in graphene flat bands. The goals are to classify the possible ground states for given microscopic symmetries and to develop a coherent understanding of the conditions under which such exotic quantum phases may arise.

• DFG Programme: CRC/Transregios
• Subproject of: TRR 183: Entangled States of Matter
• International Connection: Israel
• Applicant Institution: Universität zu Köln
• Project Heads: Professor Dr. Erez Berg, until 6/2020; Dr. Maria Hermanns, until 8/2017; Dr. David Mross; Professor Yuval Oreg, until 6/2020; Professor Dr. Johannes Reuther; Professor Dr. Adiel Stern; Professor Dr. Simon Trebst