Program of the International CECAM-Workshop
Correlated electron physics beyond the Hubbard model

Monday, February 4th 2019 (Radisson Blu Hotel Bremen)

18:00

–

21:00

Arrival and Registration

Tuesday, February 5^th 2019 (House of Science Bremen, Downtown)

08:00

–

08:50

Registration

08:50

–

09:00

Opening and welcome, Tim O. Wehling

Session:

Dynamical Mean Field Theory and diagrammatic extensions thereof

Chair: Andrew Millis

09:00

–

09:40

Philipp Werner, University of Fribourg, Switzerland
GW+DMFT simulation of lattice models in and out of equilibrium

09:40

–

10:20

Alexander I. Lichtenstein, University of Hamburg, Germany
Nonlocal correlated effects in magnetic materials

10:20

–

10:50

Coffee Break

10:50

–

11:30

Erik van Loon, University of Bremen, Germany
Dual boson approach to spatial correlations

11:30

–

12:10

James P. F. LeBlanc, Memorial University of Newfoundland, St. John’s, Canada
Hubbard-like models: challenges and solutions via analytic treatments of numerical problems

12:10

–

12:15

Group Photo

12:15

–

13:50

Lunch Break (Restaurant Q1) and Coffee

Session:

Quantum Cluster Approaches

Chair: Silke Biermann

13:50

–

14:30

Johannes Lischner, Imperial College London, United Kingdom
Many-body perturbation theory beyond GW

14:30

–

15:00

Coffee Break

15:00

–

15:40

André-Marie S. Tremblay, University of Sherbrooke, Québec, Canada
Antagonistic effects of nearest-neighbor repulsion on the
superconducting pairing dynamics in the doped Mott insulator regime

15:40

–

16:20

Round Table Discussion
Diagrammatic and cluster extensions of DMFT: where are we?

18:30

–

21:30

Welcome Reception (Bremen Town Hall)

Wednesday, February 6th 2019 (House of Science Bremen, Downtown)

Session:

Coupled cluster, FCIQMC and related quantum chemical
approaches

Chair: Philipp Werner

09:00

–

09:40

Lucas K. Wagner, University of Illinois at Urbana-Champaign,
Illinois, USA
Model Hamiltonians from ab-initio quantum Monte Carlo calculations

09:40

–

10:20

George Booth, University of Cambridge, United Kingdom
´Static´ mean-field theory, ´Dynamical´ mean-field theory, and ´Static Dynamical´ mean-field theory

10:20

–

10:50

Coffee Break

10:50

–

11:30

Silke Biermann, Ecole Polytechnique, Palaiseau, France
Non-local interactions and non-local correlations: examples of dynamical mean field calculations for realistic materials

11:30

–

12:10

Tianyu Zhu, California Institute of Technology, Pasadena, California, USA
Correlated Green`s functions in materials: towards an ab initio treatment of the Kondo problem

12:10

–

13:50

Lunch Break (Restaurant Q1) and Coffee

Session:

Constrained many-body perturbation theory, density functional theory and related methods I

Chair: Shan-Wen Tsai

13:50

–

14:30

Matteo Cococcioni, Swiss Federal Institute of Technology, Lausanne, Switzerland
Ab initio modeling of transition metal compounds using the extended DFT+U+V with self-consistent Hubbard parameters

14:30

–

15:10

Ferdi Aryasetiawan, Lund University, Sweden
The impact of long-range interaction on the electronic structure of correlated materials

15:10

–

15:50

Malte Rösner, Radboud University, Nijmegen, The Netherlands
cRPA simulations of layered materials

15:50

–

16:20

Coffee Break

16:20

–

17:00

Ryotaro Arita, University of Tokyo, Japan
Self-energy variational approach to correlated electron systems

17:00

–

17:40

Malte Schüler, University of Bremen, Germany
The Peierls-Feynman variational principle: applications to the extended Hubbard model and real materials

17:40

–

18:20

Round Table Discussion
Towards real materials: all ab-initio versus hybrid approaches in the wave function, Green function and density functional domain

18:40

Bus Pickup to Conference Dinner (Radisson Blu, Wachtstraße)

19:00

–

22:30

Conference Dinner (Restaurant Juergenshof)

Thursday, February 7^th 2019 (House of Science Bremen, Downtown)

Session:

Lattice Quantum Monte Carlo

Chair: Johannes Lischner

09:00

–

09:40

Stefan Wessel, RWTH Aachen University, Germany
Nonlocal density interactions in auxiliary-field quantum Monte Carlo simulations

09:40

–

10:20

Thomas Devereaux, Stanford University, California, USA
Metallic transport, CDWs, and pairing without quasiparticles in the Hubbard model

10:20

–

10:50

Coffee Break

10:50

–

11:30

Andrew Millis, Flatiron Institute, City of New York, New York, USA
Ground-state properties of the hydrogen chain, and beyond

11:30

–

12:10

Sandro Sorella, International School for Advanced Studies (SISSA), Trieste, Italy
New insights in the sign problem within the auxiliary field quantum Monte Carlo technique

12:10

–

13:50

Lunch Break (Restaurant Q1) and Coffee

Session:

Diagrammatic Monte Carlo

Chair: Ryotaro Arita

13:50

–

14:30

Boris Svistunov, University of Massachusetts Amherst, Massachusetts, USA
Polynomial complexity despite the fermionic sign

14:30

–

15:10

Nikolay Prokofiev, University of Massachusetts Amherst, Massachusetts, USA
Dirac liquids and interacting topological insulators by Diagrammatic Monte Carlo

Session:

Functional Renormalization Group

15:10

–

15:50

Sabine Andergassen, University of Tübingen, Germany
Multiloop functional renormalization group for response functions

15:50

–

16:30

Shan-Wen Tsai, University of California Riverside, California, USA
Effects of retardation in the renormalization group approach to interacting fermions

17:25

Poster Mounting

17:30

–

21:00

Poster Session + Catering Buffet (House of Science)

Friday, February 8^th 2019 (House of Science Bremen, Downtown)

Session:

Constrained many-body perturbation theory, density functional theory and related methods II

Chair: Tim O. Wehling

09:00

–

09:40

Carsten Honerkamp, RWTH Aachen University, Germany
Effective interactions from cfRG

09:40

–

10:20

Alexander Steinhoff, University of Bremen, Germany
GW+T-Matrix approach to the excitonic Mott transition

10:20

–

10:50

Coffee Break

10:50

–

11:30

Mark van Schilfgaarde, King’s College London, United Kingdom
QSGW+DMFT: accurate, nearly ab initio many-body treatment of strong correlations

11:30

–

12:30

Concluding Round Table Discussion
How to approach correlated materials with non-local interactions realistically: next steps

12:30

–

12:45

Closing words and Departure