FAU LMQ Research Spotlight: Fractons in the U(1) checkerboard toric
Topologically ordered phases are exotic low-temperature phases of matter. They are of interest both from a fundamental scientific perspective, because…
Prof. Dr. Kai Phillip Schmidt
Steering Committee, Speaker
Staudtstr. 7/B3
91058 Erlangen
Institute of Theoretical Physics
Lehrstuhl für Theoretische Physik (Prof. Dr. Schmidt)
Staudtstr. 7/B3
91058 Erlangen
- Phone number: +49 9131 85-28443
- Fax number: +49 9131 85-28444
- Email: kai.phillip.schmidt@fau.de
- Website: https://www.emergent.physics.nat.fau.de/person/kai-phillip-schmidt/
Posts
FAU LMQ Workshop took place on 24th March 2026 at Villa Jordan
On Tuesday, 24th March 2026, the FAU Pofile Center Light.Matter.QuantumTechnologies hosted the regular FAU LMQ Workshop at the FAU’s Guesthouse…
FAU LMQ Talk: Graph zeta methods for efficient simulations of long-range interacting quantum lattices
We are pleased to announce the FAU LMQ Talk on Thursday, January 29th, at 14:15, at the Department of Physics,…
„Lucys quantastische Weihnachtsreise“ – Physics Christmas Lecture 2025 (Audimax!)
In the birth year of quantum mechanics, 1925, the physicist Lucy Mensing travels from the physics Christmas party in Göttingen…
Collegium Alexandrinum Winter Semester 2025/2026
The lecture series in the winter semester 2025/2026 starts with a contribution to the International Year of Quantum Physics and…
FAU LMQ Research Spotlight: Coupling long-range interacting matter to a light mode
From gravity to electromagnetism, algebraically decaying long-range interactions are ubiquitous in nature. In the context of quantum many-body systems, repulsive…
Lange Nacht der Wissenschaften 2025
On October 25, 2025, the Long Night of Sciences 2025 will take place in the metropolitan region of Nuremberg-Fürth-Erlangen. In…
A cup with the President – Prof. Dr. Kai Phillip Schmidt
Visiting Prof. Dr. Kai Phillip Schmidt, Chair of Theoretical Physics Each semester, FAU President Prof. Dr. Joachim Hornegger visits professors…
Concluding meeting of the QuCoLiMa iRTG took place in Erlangen
The past days the QuCoLiMa iRTG had their final meeting. They used the time to present and discuss results obtained…
Lecture series „Modern physics on Saturday morning“ in 2025
For the summer semester 2025, three talks of the „Modern physics on Saturday morning“ lecture series are scheduled. Two of…
Publications
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Absence of topological order in the U(1) checkerboard toric code
In: SciPost Physics 20 (2026), Article No.: 56
ISSN: 2542-4653
DOI: 10.21468/SciPostPhys.20.2.056
- , , :
Quantum-critical and dynamical properties of the XXZ bilayer with long-range interactions
In: Physical Review B 111 (2025), Article No.: 024409
ISSN: 0163-1829
DOI: 10.1103/PhysRevB.111.024409 - , , , , :
Symmetry breaking and competing valence bond states in the star lattice Heisenberg antiferromagnet
In: Physical Review B 112 (2025), p. 1444231-14442311
ISSN: 0163-1829
DOI: 10.1103/nbjt-hlvx - , , :
Quantum Monte Carlo study of the bond- and site-diluted transverse-field Ising model
In: Physical Review B 112 (2025), Article No.: 014206
ISSN: 0163-1829
DOI: 10.1103/wsv6-t3rl - , :
Fracton and topological order in the XY checkerboard toric code
In: Physical Review Research 7 (2025), Article No.: L032048
ISSN: 2643-1564
DOI: 10.1103/msdd-ckq7 - , , , , , , , , , , , , :
Observation of Unprecedented Fractional Magnetization Plateaus in a New Shastry-Sutherland Ising Compound
In: Physical Review X 15 (2025), Article No.: 041045
ISSN: 2160-3308
DOI: 10.1103/9ynf-xx1t
- , , , :
Monte Carlo Based Techniques for Quantum Magnets with Long-Range Interactions
In: Entropy 26 (2024), p. 401
ISSN: 1099-4300
DOI: 10.3390/e26050401 - , , , , :
Metasurface-Based Hybrid Optical Cavities for Chiral Sensing
In: Physical Review Letters 132 (2024), Article No.: 043602
ISSN: 0031-9007
DOI: 10.1103/PhysRevLett.132.043602 - , , , , , :
Cooperative effects in dense cold atomic gases including magnetic dipole interactions
In: Physical Review Research 6 (2024), Article No.: 023147
ISSN: 2643-1564
DOI: 10.1103/PhysRevResearch.6.023147 - , , , , , :
Quantitative description of long-range order in the spin- 12 XXZ antiferromagnet on the square lattice
In: Physical Review B 110 (2024), Article No.: 054411
ISSN: 0163-1829
DOI: 10.1103/PhysRevB.110.054411 - , , , , :
Order-by-disorder in the antiferromagnetic J1-J2-J3 transverse-field Ising model on the ruby lattice
In: Physical Review Research 6 (2024), Article No.: 033339
ISSN: 2643-1564
DOI: 10.1103/PhysRevResearch.6.033339 - , , , :
Engineering photon-mediated long-range spin interactions in Mott insulators
In: Physical Review B 109 (2024), Article No.: 085149
ISSN: 0163-1829
DOI: 10.1103/PhysRevB.109.085149 - , , , :
Quantum melting of long-range ordered quantum antiferromagnets investigated by momentum-space continuous similarity transformations
In: Physical Review B 110 (2024), Article No.: 085115
ISSN: 0163-1829
DOI: 10.1103/PhysRevB.110.085115 - , , , , , , :
Kitaev honeycomb antiferromagnet in a field: quantum phase diagram for general spin
In: Communications Physics 7 (2024), Article No.: 319
ISSN: 2399-3650
DOI: 10.1038/s42005-024-01809-0 - , , , :
Quantum robustness of the toric code in a parallel field on the honeycomb and triangular lattice
In: SciPost Physics 17 (2024), Article No.: 053
ISSN: 2542-4653
DOI: 10.21468/SciPostPhys.17.2.053 - , , :
Quantum phases of hardcore bosons with repulsive dipolar density-density interactions on two-dimensional lattices
In: SciPost Physics 17 (2024), Article No.: 111
ISSN: 2542-4653
DOI: 10.21468/SciPostPhys.17.4.111 - , , :
Order-by-disorder and long-range interactions in the antiferromagnetic transverse-field Ising model on the triangular lattice—A perturbative point of view
In: Results in Physics 61 (2024), Article No.: 107794
ISSN: 2211-3797
DOI: 10.1016/j.rinp.2024.107794 - , , , , :
Quantum-critical properties of the one- and two-dimensional random transverse-field Ising model from large-scale quantum Monte Carlo simulations
In: SciPost Physics 17 (2024), Article No.: 061
ISSN: 2542-4653
DOI: 10.21468/SciPostPhys.17.2.061 - , , :
Incorporating non-local anyonic statistics into a graph decomposition
In: SciPost Physics Core 7 (2024), Article No.: 031
ISSN: 2666-9366
DOI: 10.21468/SciPostPhysCore.7.2.031 - , , :
Extracting quantum-critical properties from directly evaluated enhanced perturbative continuous unitary transformations
In: SciPost Physics 17 (2024), Article No.: 094
ISSN: 2542-4653
DOI: 10.21468/SciPostPhys.17.3.094 - , :
(Almost) everything is a Dicke model - Mapping non-superradiant correlated light-matter systems to the exactly solvable Dicke model
In: SciPost Physics Core 7 (2024), Article No.: 038
ISSN: 2666-9366
DOI: 10.21468/SciPostPhysCore.7.3.038 - , , :
Hybrid quantum-classical algorithm for the transverse-field Ising model in the thermodynamic limit
In: Physical Review B 110 (2024), Article No.: 155128
ISSN: 0163-1829
DOI: 10.1103/PhysRevB.110.155128 - , , , :
Absence of fractal quantum criticality in the quantum Newman-Moore model
In: Physical Review Research 6 (2024), Article No.: 013191
ISSN: 2643-1564
DOI: 10.1103/PhysRevResearch.6.013191
- , :
Continuously varying critical exponents in long-range quantum spin ladders
In: SciPost Physics 15 (2023), Article No.: 087
ISSN: 2542-4653
DOI: 10.21468/SciPostPhys.15.3.087 - , , , :
Linear optical elements based on cooperative subwavelength emitter arrays
In: Optics Express 31 (2023), p. 6003-6026
ISSN: 1094-4087
DOI: 10.1364/OE.476830 - , :
Projective cluster-additive transformation for quantum lattice models
In: SciPost Physics 15 (2023), Article No.: 097
ISSN: 2542-4653
DOI: 10.21468/SciPostPhys.15.3.097 - , , , :
Systematic analysis of crystalline phases in bosonic lattice models with algebraically decaying density-density interactions
In: SciPost Physics 14 (2023), Article No.: 136
ISSN: 2542-4653
DOI: 10.21468/SciPostPhys.14.5.136 - , , :
Series expansions in closed and open quantum many-body systems with multiple quasiparticle types
In: Physical Review A 108 (2023), Article No.: 013323
ISSN: 1050-2947
DOI: 10.1103/PhysRevA.108.013323 - , , :
Classical phase synchronization in dissipative non-Hermitian coupled systems
In: Physical Review A 108 (2023), Article No.: 023721
ISSN: 1050-2947
DOI: 10.1103/PhysRevA.108.023721 - , , , , , , , , , , :
Momentum-resolved spin-conserving two-triplon bound state and continuum in a cuprate ladder
In: Communications Physics 6 (2023), Article No.: 138
ISSN: 2399-3650
DOI: 10.1038/s42005-023-01250-9 - , , , :
Continuous similarity transformation for critical phenomena: Easy-axis antiferromagnetic XXZ model
In: Physical Review Research 5 (2023)
ISSN: 2643-1564
DOI: 10.1103/PhysRevResearch.5.013132
- , , , , , , , , , , , , , , , , , :
Evidence for pressure induced unconventional quantum criticality in the coupled spin ladder antiferromagnet C9H18N2CuBr4
In: Nature Communications 13 (2022)
ISSN: 2041-1723
DOI: 10.1038/s41467-022-30769-8 - , , , , :
Scaling at quantum phase transitions above the upper critical dimension
In: SciPost Physics 13 (2022), Article No.: 088
ISSN: 2542-4653
DOI: 10.21468/SciPostPhys.13.4.088 - , :
Linked cluster expansions via hypergraph decompositions
In: Physical Review E 105 (2022)
ISSN: 2470-0045
DOI: 10.1103/PhysRevE.105.064110 - , , , :
Competing topological orders in three dimensions: X-cube versus toric code
In: SciPost Physics 12 (2022), Article No.: 069
ISSN: 2542-4653
DOI: 10.21468/SCIPOSTPHYS.12.2.069 - , , , :
Quantum phase transitions in the K-layer Ising toric code
In: Physical Review B 105 (2022)
ISSN: 0163-1829
DOI: 10.1103/PhysRevB.105.184425 - , , :
Dynamic structure factor of the antiferromagnetic Kitaev model in large magnetic fields
In: Physical Review B 106 (2022), Article No.: 104403
ISSN: 0163-1829
DOI: 10.1103/PhysRevB.106.104403