Welcome to our group homepage!
Our group studies collective phenomena in quantum many-body systems that arise from the
intricate interplay of topology, strong correlations, and spin-orbit coupling.
In our work we typically complement analytical
approaches by a variety of sophisticated numerical techniques that exploit concepts
from statistical physics, quantum information theory, and computer science.
We are embedded in a lively research environment at the Institute for Theoretical Physics in Cologne and part of a number of collaborative research and funding initiatives together with our experimental colleagues in the Physics Department.
- Nishimori's cat — stable long-range entanglement in monitored quantum circuits
- Transmon platform for quantum computing challenged by chaotic fluctuations
Nature Comm. 13, 2495 (2022)
- Universal principles of moiré band structures
2D Materials 8, 044007 (2021)
- Half-integer quantized anomalous thermal Hall effect in α-RuCl3
Science 373, 568 (2021)
- Emergence of a field-driven U(1) spin liquid in the Kitaev honeycomb model
Nature Comm. 10, 530 (2019) and Phys. Rev. Research 2, 023361 (2020)
- Monte Carlo Studies of Quantum Critical Metals
Annu. Rev. Condens. Matter Phys. 10, 63 (2019) and Phys. Rev. Research 2, 023008 (2020)
Commentaries by Andrey Chubukov and Jörg Schmalian on this line of research for the condensed matter journal club.
These three-dimensional tricoordinated lattice structures are underlying our recent studies of 3D Kitaev models,
which we have shown to host an unusually rich variety of Z2 spin liquids that are all analytically tractable. Examples
include gapless spin liquids with Majorana Fermi surfaces or topologically protected Weyl nodes,
as discussed in this complete classification.
You can get three-dimensional prints of these models (depicted above) from shapeways (more cool models here) — unfortunately, shapeways recently altered their pricing structure resulting in an almost 10-fold increase of printing costs for these objects.
If you want to further delve into these lattices, check out these VESTA files: (10,3)a, (10,3)b, (10,3)c, (9,3)a, (8,3)a, (8,3)b, (8,3)c, and (8,3)n.