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

Bremen Center for Computational Materials Science - BCCMS 
University of Bremen, February 4th - February 8th 2019

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

18:00

21:00

 

Arrival and Registration

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

08:00

08:50

 

Registration

08:50

09:00

 

Opening and welcome, Tim Wehling

Session:

 

Dynamical Mean Field Theory and diagrammatic extensions thereof

 

 

Chair:

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 Lichtenstein, University of Hamburg, Germany

Non-local electron correlations within dual variable approach

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:

13:50

14:30

 

Emanuel Gull, University of Michigan, Ann Arbor, Michigan, USA
Properties of the charge ordered phase of the extended Hubbard model – results from cluster DMFT with non-local interactions

14:30

15:00

 

Coffee Break

15:00

15:40

 

André-Marie 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?

19:00

21:30

 

Welcome Reception (TBA)

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

Session:

 

Coupled cluster, FCIQMC and related quantum chemical
approaches

 

 

 

 

Chair:

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

 

Dominika Zgid, University of Michigan, Ann Arbor, Michigan, USA
Self-energy embedding method with applications to molecules and solids

11:30

12:10

 

TBA

12:10

13:50

 

Lunch Break (Restaurant Q1) and Coffee

Session:

 

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

 

 

 

 

Chair:

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, University of Southern California, Los Angeles, USA
cRPA simulations of layered materials

15:50

16:20

 

Coffee Break

16:20

17:00

 

TBA

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 (Venue: Radisson Blu Hotel, Wachtstraße)

19:00

22:30

 

 

Conference Dinner (Restaurant Juergenshof)

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

Session:

 

Lattice Quantum Monte Carlo

 

 

 

 

Chair:

09:00

09:40

 

Stefan Wessel, RWTH Aachen University, Germany
Torus spectroscopy for interacting fermions with DQMC

09:40

10:20

 

Tom Devereaux, Stanford University, California, USA
Superconductivity in extended Hubbard models

10:20

10:50

 

Coffee Break

10:50

11:30

 

Shiwei Zhang, College of William & Mary, Williamsburg, Virginia, USA
Ground-state properties of the hydrogen chain, and beyond

11:30

12:10

 

Sandro Sorella, International School for Advanced Studies (SISSA), Trieste, Italy
Ab-initio molecular dynamics and structural optimization by quantum Monte Carlo

12:10

13:50

 

Lunch Break (Restaurant Q1) and Coffee

Session:

 

Diagrammatic Monte Carlo

 

 

 

 

Chair:

13:50

14:30

 

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

14:30

15:10

 

Nikolai 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
Realistic effective interactions from the functional renormalization group

15:50

16:30

 

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

16:30

17:10

 

Round Table Discussion
Numerically exact versus approximate approaches. 1.) Extended Hubbard model as benchmark system. 2.) Promising and practical approaches to multiband problems as arising in real materials?

18:30

21:00

 

Poster Session + Catering Buffet (House of Science)

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

Session:

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

 

 

 

 

Chair:

09:00

09:40

 

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

09:40

10:20

 

TBA

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