Workshop on Quantum Monte Carlo Methods at Work for Describing Novel States of Matter

Administration

Description

An ICTP meeting in person

Quantum Monte Carlo methods represent a family of numerical techniques that have been applied in a wide variety of problems in Physics, Chemistry, Materials Science and even Biology. They are among the most successful approaches for computing the properties of interacting quantum many-body systems. Here, the principal problem, which manifests itself in different forms, is that of describing electron correlation, in either molecules, materials or effective low-energy models (e.g., Hubbard or Heisenberg), beyond mean-field-based theories. In the last 20 years, variational approaches have been dramatically improved, by devising very efficient optimization procedures; projection techniques have been also developed, allowing us to improve the accuracy by several order of magnitude with respect to what was possible only a few years ago.

The main goal of this event will be to gather together researchers working on different subjects with quantum Monte Carlo techniques to nurture new collaborations and exchange of knowledge. A couple of sessions will be devoted to honor the memory of Sandro Sorella, who pioneered key developments in the optimization of various quantum Monte Carlo algorithms.

The activities will highlight recent progress in this area in topics including, but not limited to:

Recent developments in quantum Monte Carlo techniques
Neural-network approaches within quantum Monte Carlo
Magnetism and superconductivity in lattice and continuum systems
Low-dimensional fermionic and bosonic models
Emergent exotic phases in strongly-correlated systems

Speakers:
A. ALAVI, Cambridge University
D. ALFE', University of Naples
F. ASSAAD, University of Wurzburg
N. COSTA, University of Rio de Janeiro
C. FENG, Flatiron Institute
M. FOULKES, Imperial College London
E. GULL, University of Michigan
M. HOLZMANN, LPTMC Grenoble
M. IMADA, Toyota Research Institute
T. LI, Renmin University
F. MA, Beijing Normal University China
Z.Y. MENG, University of Hong Kong
M. OGATA, University of Tokyo
Y. OTSUKA, RIKEN Center
M. QIN, Shanghai Jiaotung University
R. RESTA, IOM-CNR Trieste
A.W. SANDVIK, Boston University
G. SENATORE, University of Trieste
L. F. TOCCHIO, Politecnico di Torino
E. TOSATTI, SISSA
C. UMRIGAR, Cornell University
L. WAGNER, University of Illinois
A. ZEN, University of Naples

Call for Contributed Abstracts: All applicants are encouraged to submit an abstract for a poster presentation and/or a contributed talk. Abstract templates are available below for download.

Grants: A limited number of grants are available to support the attendance of selected participants, with priority given to participants from developing countries. There is no registration fee.

Please note that from 3 to 7 July 2023 the 'TREX School on quantum Monte Carlo methods with the TurboRVB code' will be organized at SISSA. For further information and submitting your applications please click here https://trex-coe.eu/events/trex-school-qmc-turborvb-2023

Material

Abstract Templates Final list of Participants Group Photo Poster

Workshop on Quantum Monte Carlo Methods at Work for Describing Novel States of Matter | (smr 3853)

Go to day

Monday, 10 July 2023
- 08:30 - 09:45
  - 08:30 Registration formalities 1h15'
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Upon arrival, Visitors not staying in the ICTP Guest Houses, are kindly requested to complete registration formalities at the Leonardo Building (Lobby) from 8.30 to 9.45.
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- 09:45 - 17:40
  - 09:45 Opening remarks and Sandro's legacy 30'
  - 10:15 A Strongly Correlated Life With Sandro Sorella 45'
    
    Speaker: Erio TOSATTI (ICTP, SISSA, Italy)
  - 11:00 Coffee break 30'
  - 11:30 TurboRVB: past, present and future 45'
    
    Speaker: Kosuke NAKANO (NIMS, Japan)
  - 12:15 Polaron with Quadratic Electron-phonon Interaction 25'
    
    Speaker: Stefano RAGNI (University of Vienna, Austria)
  - 12:40 Lunch break 1h50'
  - 14:30 Effects of valley degeneracy on the excitonic condensation in an electron-hole symmetric bilayer: a QMC study 45'
    
    Speaker: Gaetano SENATORE (University of Trieste, Italy)
  - 15:15 The archetypical Z_2 invariant: electrical polarization in one dimension 45'
    
    Speaker: Raffaele RESTA (University of Trieste, Italy)
  - 16:00 Coffee break 30'
  - 16:30 Magnetic, Superconducting, and Metal-Insulating Phase Transitions in the Hubbard Model 45'
    
    Speaker: Tianxing MA (Beijing Normal University, China)
  - 17:15 Transformer variational wave functions for frustrated quantum spin systems 25'
    
    Speaker: Luciano Loris VITERITTI (University of Trieste, Italy)
- 19:00 - 20:30
  - 19:00 Welcome Reception 1h30' ( Adriatico Guest House Terrace )
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All participants are cordially invited to the Welcome Reception
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Tuesday, 11 July 2023
- 09:30 - 17:40
  - 09:30 The Earth’s inner core nucleation paradox 45'
    
    Speaker: Dario ALFE (University of Naples Federico II, Italy)
  - 10:15 Fostering accuracy in modelling materials and molecular complexes with quantum Monte Carlo 45'
    
    Speaker: Andrea ZEN (University of Naples Federico II, Italy)
  - 11:00 Coffee break 30'
  - 11:30 Benchmarking the variational auxiliary field quantum Monte Carlo method 45'
    
    Speaker: Natanael DE CARVALHO COSTA (University of Rio de Janeiro, Brazil)
  - 12:15 Development of long-range phase coherence on the Kondo lattice 25'
    
    Speaker: Jianjun DONG (Chongqing University, China)
  - 12:40 Lunch break 1h50'
  - 14:30 The teaching from entanglement: 2D SU(2) antiferromagnet to valence bond solid deconfined quantum critical points are not conformal 45'
    
    Speaker: Yang Zi MENG (The University of Hong Kong)
  - 15:15 The best of both worlds: how to combine real-space concepts from VMC with orbital-based quantum chemistry 45'
    
    Speaker: Seyed Ali ALAVI-SHOVISHTARI (Max Planck Institute for Solid State Research, Germany)
  - 16:00 Coffee break 30'
  - 16:30 Variational Monte Carlo in a multi-band Hubbard model for the iron pnictides: orbital selectivity and superconductivity 45'
    
    Speaker: Luca Fausto TOCCHIO (SISSA, Italy)
  - 17:15 Directed-loop quantum Monte Carlo for retarded interactions: Competing orders from phonons & dissipation-induced orde 25'
    
    Speaker: Manuel WEBER (Institute of Theoretical Physics, Germany)
Wednesday, 12 July 2023
- 09:30 - 15:00
  - 09:30 Ab initio studies on quantum spin liquid in molecular solids and superconductivity in cuprates 45'
    
    Speaker: Masatoshi IMADA (University of Tokyo, Japan)
  - 10:15 Several new variational optimization methods and their application in highly frustrated magnetic models 45'
    
    Speaker: Tao LI (Renmin University, China)
  - 11:00 Coffee break 30'
  - 11:30 The evolving story of deconfined quantum criticality 45'
    
    Speaker: Anders Wilhelm SANDVIK (Boston University, USA)
  - 12:15 Phases and exotic phase transitions of a two-dimensional Su-Schrieffer-Heeger model 45'
    
    Speaker: Fakher Fakhry ASSAAD (Institut fur Theoretische Physik und Astrophysik, Universitat Wurzburg, Germany)
  - 13:00 Lunch break 2h0'
- 15:00 - 18:00
  - 15:00 Poster session and free discussions 3h0'
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A 'Get Together' drink will be served in the Leonardo Building Lobby
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Thursday, 13 July 2023

09:30 - 17:15

09:30 Tensor Trains: Replacing Monte Carlo with Tensor Decompositions 45'

Speaker: Christoph Emanuel GULL (University of Michigan, USA)
10:15 Metal-insulator transition and quantum magnetism in the SU(3) Fermi-Hubbard Model 45'

Speaker: Chunhan FENG (Flatiron Institute, USA)
11:00 Coffee break 30'

11:30 Excited states beyond Mott gap in half-filled Hubbard model 45'

Speaker:	Masao OGATA (University of Tokyo, Japan)
Material:	Abstract

12:15 Path Integration, Lexicographic Symmetrization, and Derivative-Free Energy Estimation Within the Stochastic Representation of Wavefunctions 25'

Speaker: Liam BERNHEIMER (School of Chemistry, Tel Aviv University, Israel)
12:40 Lunch break 1h50'
14:30 Electron gas and hydrogen: From ground state energies towards excitation speactra 45'

Speaker: Markus HOLZMANN (CNRS, France)
15:15 Models derived from many-body ab initio calculations: high accuracy using quasiparticles 45'

Speaker: Lucas Kyle WAGNER (University of Illinois, USA)
16:00 Group Photo 5'
16:05 Coffee break 25'
16:30 QMC study of Hubbard models with Dirac dispersion 45'

Speaker: Yuichi OTSUKA (RIKEN Center, Japan)

Friday, 14 July 2023
- 09:30 - 14:15
  - 09:30 Many-body electronic structure calculations by auxiliary-field quantum Monte Carlo 45'
    
    Speaker: Fengjie MA (Beijing Normal University, China)
  - 10:15 Stripe and superconductivity in the doped 2D Hubbard model 45'
    
    Speaker: Mingpu QIN (Shanghai Jiao Tong University, China)
  - 11:00 Coffee break 30'
  - 11:30 Approximating Many-Electron Wave Functions using Neural Networks 45'
    
    Speaker: William Matthew Colwyn FOULKES (Imperial College London, Blackett Laboratory, UK)
  - 12:15 Lunch break and departure 2h0'