About

Prof. Dr. Sabine Andergassen is the head of the Research Group "Computational Quantum Science", affiliated both with the Research Unit “Machine Learning” at the Faculty of Informatics as well as “Correlations: Theory and Experiments” at the Faculty of Physics.

Her main research focus is in the area of quantum many-body physics. In particular, she employs renormalization-group approaches to investigate the fundamental mechanisms underlying the physical behavior of model systems for materials, cold atomic gases and nanostructures. New perspectives on the high-dimensional data arising naturally in such complex interacting systems are revealed also by machine learning methods. At the same time, methods from statistical physics and quantum many-body theory can improve the understanding of the working principles of modern machine learning methods.

Sabine Andergassen is also Deputy Director of the iCAIML Doctoral College, the coordinator of the Quantum Physics Special Interest Group of CAIML, and the Vice Dean of Academic Affairs for the Master’s Programme Quantum Information Science and Technology.

Roles

Associate Professor
Machine Learning, E194-06
Curriculum Coordinator
Master Quantum Information Science and Technology

Contact

Courses

2024W

Bachelor Thesis in Computer Science / 194.112 / PR
Introduction to Machine Learning / 194.025 / VU
Introduction to Quantum Physics: Basic Concepts and Foundations / 194.171 / VU
Privatissimum for Doctor's Thesis / 194.028 / PV
Project in Computer Science 1 / 194.145 / PR
Quantum Physics: Basic Concepts and Foundations / 194.169 / VU
Scientific Research and Writing / 193.052 / SE
Seminar for PhD Students / 194.110 / SE

2025S

Bachelor Thesis in Computer Science / 194.112 / PR
Journal Club "Solid State Physics: Theory and Experiment" / 194.138 / SE
Orientation Bachelor with Honors of Informatics and Business Informatics / 180.767 / SE
Project in Computer Science 1 / 194.145 / PR
Scientific Research and Writing / 193.052 / SE
Seminar for PhD Students / 194.110 / SE

Projects

Microscopic derivation of effective Hamiltonians
2024 – 2027 / Austrian Science Fund (FWF)
Publication: 213472
Modellierung und adaptive Regelung von industriellen Altholz- und Reststoffkesseln mit Neuronalen Netzen
2024 – 2025 / CONENGA Engineers GmbH

Publications

2025

Disentangling real space fluctuations: The diagnostics of metal-insulator transitions beyond single-particle spectral functions / Meixner, M., Krämer, M. N., Wentzell, N., Bonetti, P. M., Andergassen, S., Toschi, A., & Schaefer, T. (2025, March 20). Disentangling real space fluctuations: The diagnostics of metal-insulator transitions beyond single-particle spectral functions [Conference Presentation]. 88. Jahrestagung der DPG und DPG-Frühjahrstagung 2025 der Sektion Kondensierte Materie, Berlin, Germany.
Cluster extension of the DMF2RG and application to the 2d Hubbard model / Krämer, M. N., Meixner, M., Fraboulet, K., Bonetti, P. M., Vilardi, D., Wentzell, N., Schaefer, T., Toschi, A., & Andergassen, S. (2025, March 18). Cluster extension of the DMF2RG and application to the 2d Hubbard model [Conference Presentation]. 88. Jahrestagung der DPG und DPG-Frühjahrstagung 2025 der Sektion Kondensierte Materie, Berlin, Germany.
Single-boson exchange formulation of the Schwinger-Dyson equation and its application to the functional renormalization group / Patricolo, M., Gievers, M., Fraboulet, K., Al-Eryani, A., Heinzelmann, S., Bonetti, P., Toschi, A., Vilardi, D., & Andergassen, S. (2025). Single-boson exchange formulation of the Schwinger-Dyson equation and its application to the functional renormalization group. SciPost Physics, 18(3), Article 078. https://doi.org/10.21468/SciPostPhys.18.3.078
Project: Quantenspinsysteme P7 (2024–2027)

2024

Machine learning stochastic differential equations for the evolution of order parameters of classical many-body systems in and out of equilibrium / Carnazza, F., Carollo, F., Andergassen, S., Martius, G., Klopotek, M., & Lesanovsky, I. (2024). Machine learning stochastic differential equations for the evolution of order parameters of classical many-body systems in and out of equilibrium. MACHINE LEARNING-SCIENCE AND TECHNOLOGY, 5(4), Article 045002. https://doi.org/10.1088/2632-2153/ad7ad7
Towards nonperturbative nonlocal correlations in the 2d Hubbard Model with the fRG / Krämer, M. N., Meixner, M., Fraboulet, K., Bonetti, P. M., Vilardi, D., Wentzell, N., Toschi, A., Schäfer, T., & Andergassen, S. (2024, September 24). Towards nonperturbative nonlocal correlations in the 2d Hubbard Model with the fRG [Poster Presentation]. 12th International Conference on the Exact Renormalization Group, Switzerland. http://hdl.handle.net/20.500.12708/202011
fRG Analysis and Fluctuation Diagnostics of the Hubbard-Holstein Model / Al-Eryani, A., Andergassen, S., & Scherer, M. (2024, September 24). fRG Analysis and Fluctuation Diagnostics of the Hubbard-Holstein Model [Poster Presentation]. 12th International Conference on the Exact Renormalization Group, Switzerland.
Fluctuation Diagnostics of the influence of Einstein Phonons on Electronic Orders in the Normal State / Al-Eryani, A., Andergassen, S., & Scherer, M. (2024, September 18). Fluctuation Diagnostics of the influence of Einstein Phonons on Electronic Orders in the Normal State [Poster Presentation]. Autumn School on Correlated Electrons: Correlations and Phase Transitions, Germany. http://hdl.handle.net/20.500.12708/203072
Compressing the two-particle Green’s function using wavelets: Theory and application to the Hubbard atom / Moghadas, E., Dräger, N., Toschi, A., Zang, J., Medvidović, M., Kiese, D., Millis, A. J., Sengupta, A., Andergassen, S., & Di Sante, D. (2024). Compressing the two-particle Green’s function using wavelets: Theory and application to the Hubbard atom. European Physical Journal Plus, 139, Article 700. https://doi.org/10.1140/epjp/s13360-024-05403-9
Non-local interactions from weak to strong coupling: a functional RG description / Andergassen, S. (2024, July 23). Non-local interactions from weak to strong coupling: a functional RG description [Keynote Presentation]. QUAST Colloquium, Austria.
Machine learning dynamics of order parameters / Carnazza, F., Carollo, F., Klopotek, M., Martius, G., Andergassen, S., & Lesanovsky, I. (2024, July 9). Machine learning dynamics of order parameters [Poster Presentation]. 6th Cluster Conference “Machine Learning in Science” 2024, Germany. http://hdl.handle.net/20.500.12708/199767
Inferring interpretable dynamical generators of local quantum observables from projective measurements through machine learning / Cemin, G., Carnazza, F., Andergassen, S., Martius, G., Carollo, F., & Lesanovsky, I. (2024). Inferring interpretable dynamical generators of local quantum observables from projective measurements through machine learning. Physical Review Applied, 21(4), Article L041001. https://doi.org/10.1103/PhysRevApplied.21.L041001
Towards nonperturbative nonlocal correlations in the 2d Hubbard Model with the fRG / Krämer, M., Meixner, M., Fraboulet, K., Bonetti, P. M., Vilardi, D., Wentzell, N., Schäfer, T., Toschi, A., & Andergassen, S. (2024, March 22). Towards nonperturbative nonlocal correlations in the 2d Hubbard Model with the fRG [Conference Presentation]. DPG Verhandlungen der Deutschen Physikalischen Gesellschaft 2024, Freiburg, Germany. http://hdl.handle.net/20.500.12708/196105
Single-boson exchange formulation of the Schwinger-Dyson equation and its application to the functional renormalization group / Patricolo, M., Gievers, M., Fraboulet, K., Heinzelmann, S., Vilardi, D., Bonetti, P. M., & Andergassen, S. (2024, March 22). Single-boson exchange formulation of the Schwinger-Dyson equation and its application to the functional renormalization group [Conference Presentation]. DPG Verhandlungen der Deutschen Physikalischen Gesellschaft 2024, Freiburg, Germany. http://hdl.handle.net/20.500.12708/196024
Engineering the speedup of quantum tunneling in Josephson systems via dissipation / Hauff, J., Ankerhold, J., Rastelli, G., Belzig, W., Andergassen, S., & Maile, D. (2024, March 20). Engineering the speedup of quantum tunneling in Josephson systems via dissipation [Conference Presentation]. DPG Verhandlungen der Deutschen Physikalischen Gesellschaft 2024, Freiburg, Germany. http://hdl.handle.net/20.500.12708/196025
Mott transition and pseudogap of the square-lattice Hubbard model: Results from center-focused cellular dynamical mean-field theory / Meixner, M., Menke, H., Klett, M., Heinzelmann, S., Andergassen, S., Hansmann, P., & Schäfer, T. (2024). Mott transition and pseudogap of the square-lattice Hubbard model: Results from center-focused cellular dynamical mean-field theory. SciPost Physics, 16(2), Article 059. https://doi.org/10.21468/SciPostPhys.16.2.059

2023

Correlations on all length scales in the Hubbard model and beyond / Andergassen, S. (2023, September 21). Correlations on all length scales in the Hubbard model and beyond [Conference Presentation]. PHD-WORKSHOP FOR 5413, Germany.
fRG analysis of the extended Hubbard model - SBE fluctuation diagnostics of screening / Al-Eryani, A., Heinzelmann, S., & Andergassen, S. (2023, September 18). fRG analysis of the extended Hubbard model - SBE fluctuation diagnostics of screening [Poster Presentation]. Autumn School on Correlated Electrons: Orbital Physics in Correlated Matter, Germany. http://hdl.handle.net/20.500.12708/188844
Single-boson-exchange functional renormalization group and its application to the Hubbard model / Fraboulet, K., & Andergassen, S. (2023, September 6). Single-boson-exchange functional renormalization group and its application to the Hubbard model [Conference Presentation]. numErical MEthods for fRG in condENsed maTter, Germany. http://hdl.handle.net/20.500.12708/188320
Modular fRG Code for Lattice Fermion Systems: Challenges, Strategies and Ideas / Al-Eryani, A., & Andergassen, S. (2023, September 6). Modular fRG Code for Lattice Fermion Systems: Challenges, Strategies and Ideas [Conference Presentation]. numErical MEthods for fRG in condENsed maTter, Germany. http://hdl.handle.net/20.500.12708/188319
Cluster Extension of DMF²RG / Krämer, M., & Andergassen, S. (2023, September 5). Cluster Extension of DMF2RG [Poster Presentation]. numErical MEthods for fRG in condENsed maTter, Germany. http://hdl.handle.net/20.500.12708/188317
Single Boson Exchange fRG for Extended Hubbard Interactions / Al-Eryani, A., Scherer, M., & Andergassen, S. (2023, September 5). Single Boson Exchange fRG for Extended Hubbard Interactions [Poster Presentation]. numErical MEthods for fRG in condENsed maTter, Germany. http://hdl.handle.net/20.500.12708/188318
Functional Renormalization Group Analysis of the Pseudogap Opening in the Hubbard Model / Patricolo, M., & Andergassen, S. (2023, September 5). Functional Renormalization Group Analysis of the Pseudogap Opening in the Hubbard Model [Poster Presentation]. numErical MEthods for fRG in condENsed maTter, Germany.
Cluster extension of DMF2RG / Krämer, M., Fraboulet, K., Vilardi, D., Bonetti, P. M., Meixner, M., Schäfer, T., & Andergassen, S. (2023, July 24). Cluster extension of DMF2RG [Poster Presentation]. Workshop “Correlations in Novel Quantum Materials” 2023, Stuttgart, Germany. http://hdl.handle.net/20.500.12708/187904
The Mott metal-insulator transition in the two-dimensional Hubbard model - a cellular dynamical mean-field study on large clusters / Meixner, M., Klett, M., Heinzelmann, S., Wentzell, N., Hansmann, P., Andergassen, S., & Schäfer, T. (2023, July 24). The Mott metal-insulator transition in the two-dimensional Hubbard model - a cellular dynamical mean-field study on large clusters [Poster Presentation]. Workshop “Correlations in Novel Quantum Materials” 2023, Germany. http://hdl.handle.net/20.500.12708/187908
Single-boson-exchange functional renormalization group and its application to the Hubbard model / Fraboulet, K., Al-Eryani, A., Andergassen, S., & Heinzelmann, S. (2023, July 24). Single-boson-exchange functional renormalization group and its application to the Hubbard model [Poster Presentation]. Workshop “Correlations in Novel Quantum Materials” 2023, Germany. http://hdl.handle.net/20.500.12708/187907
Efficient fRG flow equations for extended interactions and an application to the square and triangular lattices / Al-Eryani, A., Heinzelmann, S., Fraboulet, K., Scherer, M., & Andergassen, S. (2023, July 24). Efficient fRG flow equations for extended interactions and an application to the square and triangular lattices [Poster Presentation]. Workshop “Correlations in Novel Quantum Materials” 2023, Germany. http://hdl.handle.net/20.500.12708/188221
Pseudogap opening in the Hubbard model at strong coupling / Patricolo, M., Vilardi, D., Heinzelmann, S., Andergassen, S., & Bonetti, V. (2023, July 24). Pseudogap opening in the Hubbard model at strong coupling [Poster Presentation]. Workshop “Correlations in Novel Quantum Materials” 2023, Germany. http://hdl.handle.net/20.500.12708/187905
Machine learning dynamics of quantum systems / Andergassen, S. (2023, May 8). Machine learning dynamics of quantum systems [Presentation]. TACO Colloquium, Austria.
Pseudogap opening in the Hubbard model at strong coupling / Patricolo, M., Heinzelmann, S., Bonetti, P. M., Vilardi, D., & Andergassen, S. (2023, May 4). Pseudogap opening in the Hubbard model at strong coupling [Poster Presentation]. Exploring New Topics with Functional Renormalisation, Germany. http://hdl.handle.net/20.500.12708/187802
Machine learning dynamics of quantum systems / Andergassen, S. (2023, April 13). Machine learning dynamics of quantum systems [Conference Presentation]. Machine Learning and (Quantum) Physics Workshop 2023, Obergurgl, Austria.

Supervisions

Modelling and adaptive control of industrial waste wood and residue boilers using neural networks / Voith, S. (2025). Modelling and adaptive control of industrial waste wood and residue boilers using neural networks [Diploma Thesis, Technische Universität Wien]. reposiTUm. https://doi.org/10.34726/hss.2025.124592

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Sabine Andergassen