Thomas SCHAFER

Post-Doctorant

Equipe de recherche : Matière condensée

 

Adresse CPHT, Ecole Polytechnique, 91128 Palaiseau cedex, France
Tél. 01 69 33 42 81
Fax 01 69 33 49 49
Contact prenom.nom@polytechnique.edu
Bureau Aile zéro, Piéce 1006

 

Thématiques de recherche : 

Strongly correlated electron systems
Physics of the Hubbard model
Mott-Hubbard metal-insulator transition
low-dimensional systems

Quantum criticality
quantum and classical critical phenomena
quantum magnetism
electronic Kohn anomalies

High-temperature superconductivity
pseudogap physic
unconventional pairing mechanisms

Quantum many-body techniques
dynamical mean field theory (DMFT)
cluster (DCA) and diagrammatic (DΓA, TRILEX) extensions of DMFT
fluctuation diagnostics and parquet decomposition

Thèse : "Classical and quantum phase transitions in strongly correlated electron systems", soutenue le 29/09/2016, TU Wien (Austria), 
Directeurs de thèse : Karsten Held and Alessandro Toschi (both TU Wien)

Publication :

Articles :

Kitatani M, Schafer T, Aoki H, Held K.
Why the critical temperature of high-T-c cuprate superconductors is so low: The importance of the dynamical vertex structure.
Physical Review B. 2019;99(4):041115.
DOI: 10.1103/PhysRevB.99.041115.

Chalupa P, Gunacker P, Schafer T, Held K, Toschi A.
Divergences of the irreducible vertex functions in correlated metallic systems: Insights from the Anderson impurity model.
Physical Review B. 2018;97(24):245136.
DOI: 10.1103/PhysRevB.97.245136.

Gunnarsson O, Merino J, Schafer T, Sangiovanni G, Rohringer G, Toschi A.
Complementary views on electron spectra: From fluctuation diagnostics to real-space correlations.
Physical Review B 2018;97(12):125134.
DOI: 10.1103/PhysRevB.97.125134

Breakdown of traditional many-body theories for correlated electrons
O. Gunnarsson, G. Rohringer, T. Schäfer, G. Sangiovanni, and A. Toschi
Phys. Rev. Lett. 119, 056402 (2017)
DOI:https://doi.org/10.1103/PhysRevLett.119.056402                

Interplay of correlations and Kohn anomalies in three dimensions: quantum criticality with a twist
T. Schäfer, A. A. Katanin, K. Held, and A. Toschi
Phys. Rev. Lett. 119, 046402 (2017)
DOI:https://doi.org/10.1103/PhysRevLett.119.046402

Non-perturbative landscape of the Mott-Hubbard transition: Multiple divergence lines around the critical endpoint      
T. Schäfer, S. Ciuchi, M. Wallerberger, P. Thunström, O. Gunnarsson, G. Sangiovanni, G. Rohringer, and A. Toschi
Phys. Rev. B 94, 235108 (2016)
DOI:https://doi.org/10.1103/PhysRevB.94.235108

Parquet decomposition calculations of the electronic self-energy            
O. Gunnarsson, T. Schäfer, J. P. F. LeBlanc, J. Merino, G. Sangiovanni, G. Rohringer, and A. Toschi
Phys. Rev. B 93, 245102 (2016)
Featured as Editor's Suggestion
DOI:https://doi.org/10.1103/PhysRevB.93.245102

Momenum structure of the self-energy and its parametrization for the two-dimensional Hubbard model           
P. Pudleiner, T. Schäfer, D. Rost, G. Li, K. Held, and N. Blümer
Phys. Rev. B 93, 195134 (2016)
DOI:https://doi.org/10.1103/PhysRevB.93.195134

Fluctuation Diagnostics of the Electron Self-Energy: Origin of the Pseudogap Physics     
O. Gunnarsson, T. Schäfer, J. LeBlanc, E. Gull, J. Merino, G. Sangiovanni, G. Rohringer, and A. Toschi
Phys. Rev. Lett. 114, 236402 (2015)
DOI:https://doi.org/10.1103/PhysRevLett.114.236402

Separability of dynamical and nonlocal correlations in three dimensions
T. Schäfer, A. Toschi, and Jan M. Tomczak
Phys. Rev. B 91, 121107(R) (2015)
DOI:https://doi.org/10.1103/PhysRevB.91.121107

Fate of the false Mott-Hubbard transition in two dimensions      T. Schäfer, F. Geles, D. Rost, G. Rohringer, E. Arrigoni, K. Held, N. Blümer, M. Aichhorn, and A. Toschi
Phys. Rev. B. 91, 125109 (2015)
DOI:https://doi.org/10.1103/PhysRevB.91.12510

Dynamical vertex approximation in its parquet implementation: Application to Hubbard nanoring
A. Valli, T. Schäfer, P. Thunström, G. Rohringer, S. Andergassen, G. Sangiovanni, K. Held, and A. Toschi
Phys. Rev. B 91, 115115 (2015)
DOI:https://doi.org/10.1103/PhysRevB.91.115115

Divergent Precursors of the Mott-Hubbard Transition at the Two-Particle Level
T. Schäfer, G. Rohringer, O. Gunnarsson, S. Ciuchi, G. Sangiovanni, and A. Toschi             
Phys. Rev. Lett. 110, 246405 (2013)
DOI:https://doi.org/10.1103/PhysRevLett.110.246405

 

Conference Proceedings

Fluctuation Diagnostics of Electronic Spectra     
O. Gunnarsson, T. Schäfer, J. LeBlanc, E. Gull, J. Merino, G. Sangiovanni, G. Rohringer, and A. Toschi Proceedings of the Vienna Young Scientists Symposium, 9.-10.06.2016         TU Wien             
ISBN 978-3-9504017-2-1
pdf : https://vss.tuwien.ac.at/fileadmin/t/vss/manuscript_VSS2016.pdf

Dynamical vertex approximation for the two-dimensional Hubbard model          
T. Schäfer, A. Toschi, and K. Held             
J. Magn. Magn. Mater. 400, 107–111 (2015)
https://doi.org/10.1016/j.jmmm.2015.07.103

Development of the digital storage Fuon             
H. Ostad-Ahmad-Ghorabi, T. Schäfer, A. Spielauer, G. Aschinger, and D. Collado-Ruiz     
Proceedings of the 19th International Conference on Engineering Design (ICED13), Design for Harmonies, Vol.2: Design Theory and Research Methodology, Seoul, Korea, 19-22.08.2013              
ISBN 978-1-904670-45-2               

Preprints

Complementary views on electron spectra: From Fluctuation Diagnostics to real space correlations O. Gunnarsson, J. Merino, T. Schäfer, G. Sangiovanni, G. Rohringer, and A. Toschi
arXiv : https://arxiv.org/abs/1711.07671

Divergences of the irreducible vertex functions in correlated metallic systems: Insights from the Anderson Impurity Model  
P. Chalupa, P. Gunacker, T. Schäfer, K. Held, A. Toschi   
arXiv : https://arxiv.org/abs/1712.04171

Why Tc is so low in high-Tc cuprates: importance of the dynamical vertex structure       
M. Kitatani, T. Schäfer, H. Aoki, K. Held
arXiv : https://arxiv.org/abs/1801.05991

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