Conferences

Conferences & Schools

Virtual Conference: Frontiers of Quantum Computing and Quantum Dynamics
Participant, 19/10/2020 - 20/10/2020
Organised by Kavli Institute for Theoretical Physics, University of California, Santa Barbara, US

Virtual Workshop: Dynamics, criticality, and universality in random quantum circuits
Participant, 30/09/2020 - 02/10/2020
Organised by MPI-PKS, Dresden, Germany

Virtual Workshop: Fundamental Aspects of Statistical Mechanics and the Emergence of Thermodynamics in Non-Equilibrium Systems
Speaker, 21/09/2020 - 23/09/2020
Organised by DFG Research Unit FOR2692, Germany (Bielefeld University, Forschungszentrum Jülich, Oldenburg University, and Osnabrück University)

Program and list of abstracts: HERE.

Virtual Conference: Localisation 2020
Speaker, 24/08/2020 - 29/08/2020
Organised by Hokkaido University, Japan

Topics:

  • Anderson localization & transition
  • Topological insulators
  • 2D metal-insulator transition & electron interaction
  • Many body-localisation
  • Integer quantum Hall systems
  • Non-Hermitian systems
  • Cold atoms
  • Weyl semimetals

Talk: Measurement-induced transition in random quantum circuits: from stroboscopic to continuous
M. Szyniszewski, A. Romito, H. Schomerus

Virtual International Workshop: Real-time Dynamics in Strongly Correlated Quantum Matter
Participant, 08/04/2020 - 09/04/2020
Organised by MPI-PKS, Dresden, Germany

Online workshop: Many-body physics out of equilibrium
Participant, 24/03/2020
Organised by MPI-PKS, Dresden, Germany

Physics by the Lake 2019
Tutor & presenter, 12/08/2019 - 16/08/2019
Venue: The University of Stirling, Stirling, UK

Talk: Localisation, ergodicity, and quantum measurements

Topological Quantum Matter: From Low-Temperature Physics to Non-Equilibrium Dynamics
Participant, 05/08/2019 - 09/08/2019
Venue: Nordita, Stockholm

Talk: Entanglement transition from variable-strength weak measurements
M. Szyniszewski, A. Romito, H. Schomerus

School and Conference on Complex Quantum Systems out of Equilibrium in Many-Body Physics and Beyond
Participant, 27/05/2019 - 07/06/2019
Venue: Yerevan State University, Yerevan, Armenia

Conference on Quantum Measurement: Fundamentals, Twists, and Applications
Participant, 29/04/2019 - 04/05/2019
Venue: ICTP, Trieste, Italy

Topics:

  • Foundations of quantum mechanics
  • Quantum measurement in information processing
  • Quantum measurements in nanodevices
  • Quantum measurement and thermodynamics
  • Quantum metrology and precision measurements
Summer School on Collective Behaviour in Quantum Matter
Participant, 27/08/2018 - 14/09/2018
Venue: ICTP, Trieste, Italy

Topics:
1. Statistical Mechanics: from foundations to quantum information.
2. Numerical methods: high-level programming and advanced numerical methods.
3. Coherent dynamics: entanglement, decoherence, phase transitions, driven systems.
4. Topological quantum matter: phases and diagnostics.
5. Physical implementations: cold atoms, trapped ions, nanophysics, materials.

Lecturers:
F. Alet (CNRS, Toulouse, France)
E. Andrei (Rutgers University, US)
B. Beri (University of Cambridge, UK)
I. Bloch (MPQ, Garching, Germany)
P. Calabrese (SISSA, Trieste, Italy)
J. Chalker (University of Oxford, UK)
X. Chen (Caltech, US)
J. Dalibard (College de France, Paris, France)
M. Devoret (Yale University, US)
D. Dhar (Indian Institute of Science Education and Research, Pune)
M. Heyl (MPIPKS Dresden, Germany)
V. Khemani (Harvard University, US)
W. Krauth (Ecole Normale Superieure, Paris, France)
B. Lake (Berlin Technical University, Germany)
C. Laumann (Boston University, US)
A. Lazarides (MPIPKS Dresden, Germany)
A. MacKenzie (MPI-CPfS Dresden, Germany)
E. Martinez (University of Copenhagen, Denmark)
U. Schollwoeck (LMU Munich, Germany)
M. Znidaric (University of Ljubljana, Slovenia)

Lancaster Probability Days 2018
Participant, 22/05/2018 - 24/05/2018
Venue: Postgraduate Statistics Centre, Lancaster, UK

Topics:

  • Modern Applications of Random Permutations
  • Random Matrices and Quantum Symmetries
  • Applications of Probability in Statistical Learning Theory
Topological Matter in Artificial Gauge Fields
Participant, 26/02/2018 - 02/03/2018
Venue: Max Planck Institute for the Physics of Complex Systems, Dresden, Germany

Topics:

  • Floquet engineering (Andre Eckardt)
  • Topological order and anyons (Belen Paredes)
  • Chern numbers counted in a synthetic-dimension quantum Hall strip (Ian B. Spielman)
  • Realization of gauge fields in quantum gases (Ian B. Spielman)
  • Topological insulators (Jan Carl Budich)
  • Experimental realization of Chern insulators / Gauge fields in optical lattices (Monika Aidelsburger)
  • Floquet topological insulators in photonic wave-guides (Alexander Szameit)
  • Fractional Chern insulators and Methods (Frank Pollmann)
  • Floquet states of irradiated electrons in topological solid-state systems (Fahad Mahmood)
2017 Arnold Sommerfeld School: Numerical methods for correlated many-body systems
Participant, 11/09/2017 - 15/09/2017
Venue: Arnold Sommerfeld Center for Theoretical Physics, LMU, Munich, Germany

Lecturers (and preliminary topics):

  • Philippe Corboz (Amsterdam): Projected entangled pair states (PEPS) (introduction)
  • Olivier Parcollet (Saclay): Dynamical Mean Field Theory (DMFT) and impurity solvers
  • Lode Pollet (LMU): Quantum Monte Carlo methods
  • Ulrich Schollwoeck (LMU): Matrix product states (MPS), Density matrix renormalization group (DMRG)
  • Norbert Schuch (MPQ): PEPS (mathematical aspects)
  • Andreas Weichselbaum (LMU): Numerical renormalization group (NRG)
  • Steve White (UC Irvine): DMRG in two dimensions
International Conference on Strongly Correlated Electron Systems 2017 (SCES2017)
Participant, 16/07/2017 - 21/07/2017
Venue: Clarion Congress Hotel Prague, Prague, Czech Republic

Poster: Charge-density-wave phases of a one-dimensional model with long-range repulsive interactions

The 35th International Symposium on Lattice Field Theory (Lattice 2017)
Participant, 18/06/2017 - 24/06/2017
Venue: Palacio de Congresos de Granada, Granada, Spain

Poster: Charge-density-wave phases of a one-dimensional model with long-range repulsive interactions

Abstract:
The one-dimensional extended t-V model on a lattice describes fermions with repulsive interactions of finite range and exhibits a quantum phase transition between a Luttinger liquid conducting phase and a Mott insulating phase. Its properties make it useful in the description of candidate materials for Mott transistor devices. It is known that by tailoring the potential energy of the insulating system, one can force a phase transition into a different insulating phase [1, 2]. We show how to construct all possible charge-density-wave phases of the system at low critical densities in the atomic limit. Higher critical densities are investigated by a brute-force analysis of the possible finite unit cells of the Fock states. We present example phase diagrams of the system.

We construct a matrix product operator representation of the Hamiltonian of the t-V model. Using the matrix product states (MPS) approach we go beyond the atomic limit, where the phase diagrams are much richer. MPS method is especially problematic near the transition between two different charge-density-wave phases and we show how the bond dimension must be increased in order to converge the results.

Our results indicate that the number of possible insulating phases grows with both the maximum interaction range and the fermion density and may cause the loss of insulating properties of the material at finite temperatures.

References:
[1] P. Schmitteckert and R. Werner, Phys. Rev. B, 69, 195115 (2004).
[2] T. Mishra, J. Carrasquilla, and M. Rigol, Phys. Rev. B, 84, 115135 (2011).

N8 HPC Network Event - New approaches to atomistic / quantum simulation of materials
Speaker, 07/01/2017
Venue: The Bar Convent, York, UK

Talk: Effects of strain in graphene/hexagonal-boron-nitride heterostructures
M. Szyniszewski, E. Mostaani, N.D. Drummond, V.I. Fal'ko

The 34th International Symposium on Lattice Field Theory (Lattice 2016)
Participant, 24/07/2016 - 30/07/2016
Venue: University of Southampton, Southampton, UK

Poster: Fermions with long-range interactions using a matrix-product-states approach

Abstract:
The long-range t-V model of fermions on a lattice is known to exhibit a transition between a Luttinger liquid phase and a Mott insulator phase [1]. At insulating densities, one can tailor the potential energy of the model in such a way that one forces a quantum phase transition to either another insulating charge-density-wave phase, a bond-order phase or a Luttinger liquid [2]. We show how to construct a matrix product operator representation of the Hamiltonian of the t-V model and we present phase diagrams calculated using the matrix-product-states approach [3]. We compare these phase diagrams with results obtained in the atomic limit.

References:
[1] G. Gomez-Santos, Phys. Rev. Lett. 70, 3780 (1993).
[2] P. Schmitteckert and R. Werner, Phys. Rev. B 69, 195115 (2004); T. Mishra et al., Phys. Rev. B 84, 115135 (2011).
[3] D. Perez-Garcia et al., Quantum Inf. Comput. 7, 401 (2007); F. Verstraete et al., Adv. Phys. 57, 143 (2008).

NoWNano Summer Conference 2016
Speaker, 27/06/2016 - 30/06/2016
Venue: Cranage Hall, Cheshire, UK

Talk: Diffusion Monte Carlo study of charge carrier complexes in two-dimensional semiconductors
M. Szyniszewski, E. Mostaani, C. Price, R. Maezono, N. Drummond, V. Fal'ko

CPP5 and N8 HPC Network Event - New approaches to atomistic / quantum simulation of materials
Speaker, 08/01/2016
Venue: The Bar Convent, York, UK

Talk: Diffusion Monte Carlo study of charge carrier complexes in two-dimensional semiconductors
M. Szyniszewski, E. Mostaani, C. Price, R. Maezono, N. Drummond, V. Fal'ko

Psi-k 2015 Conference
Speaker, 06/09/2015 - 11/09/2015
Venue: Kursaal Event Centre, San Sebastian / Donostia, Spain

Talk: Diffusion Monte Carlo study of charge carrier complexes in two-dimensional semiconductors
M. Szyniszewski, E. Mostaani, N. Drummond, V. Fal'ko

Abstract:
We use a novel description of the interaction between charges in two-dimensional (2D) semiconductors to investigate the binding properties of two-, three- and four-particle complexes of charge carriers (excitons, trions and biexcitons). We report binding energies and pair distribution functions calculated using diffusion quantum Monte Carlo methods, which are exact for these systems. Our results will enable the interpretation of experimental photoabsorption and photoluminescence measurements on 2D transition-metal dichalcogenide materials. We show that our data are consistent with previous binding-energy data for the limits in which the interactions between charges reduce to logarithmic and Coulomb (1/r) forms. We find that the logarithmic interaction that has previously been used to study excitons and trions in 2D semiconductors provides an inadequate description of the behaviour of systems such as molybdenum disulphide, and we provide accurate binding-energy data for excitons, trions and biexcitons in these materials.

The 33rd International Symposium on Lattice Field Theory (Lattice 2015)
Participant, 13/07/2015 - 18/07/2015
Venue: Kobe International Conference Center, Kobe, Japan

Poster: Strong coupling expansion of the $t$-$V$ model (further results)
M. Szyniszewski, E. Burovski

Abstract:
We employ a strong coupling expansion - similar to the one used in the lattice field theory studies [1] - to solve the one-dimensional extended $t$-$V$ model of fermions on a lattice [2]. This model is solved for a range of filling factors, including both commensurate - where a charge density wave is present - and incommensurate densities. The first set consists not only of a trivial case of half filling. The method allows us to trace the transition from a Luttinger liquid phase to a Mott insulating phase and calculate the critical parameter $K$. This simple yet powerful method is not based on Bethe ansatz and it works for both integrable and non-integrable systems. Furthermore, we investigate how tailoring the interaction can introduce other ordered phases of the system [3].

References:
[1] C.J. Hamer, Phys. Lett. B 82, 75-78 (1979); D.P. Crewther, C.J. Hamer, Nucl. Phys. B 170, 353-368 (1980).
[2] G. Gomez-Santos, Phys. Rev. Lett. 70, 3780 (1993); R.G. Dias, Phys. Rev. B 62, 7791 (2000).
[3] P. Schmitteckert, R. Werner, Phys. Rev. B 69, 195115 (2004); T. Mishra et al., Phys. Rev. B 84, 115135 (2011).

Tensor Network Summer School 2015
Participant, 01/06/2015 - 05/06/2015
Venue: Ghent University, Ghent, Belgium

Topics:

  • matrix product states (MPS)
  • projected entangled pair states (PEPS)
  • multiscale entanglement renormalization ansatz (MERA)
International Conference on Strongly Correlated Electron Systems 2014
Participant, 07/07/2014 - 11/07/2014
Venue: Campus Saint Martin d'Heres, Grenoble, France

Poster: Generalised $t$-$V$ model in one dimension
M. Szyniszewski, E. Burovski

Abstract:
We use a strong coupling expansion [1] to solve the one-dimensional extended $t$-$V$ model of fermions [2,3]. The model is solved for a range of densities, including both commensurate - where a charge density wave is present - and incommensurate densities. The first set consists not only of a trivial case of half filling. The method allows us to trace the transition from a Luttinger liquid phase to a Mott insulating phase. This simple yet powerful method is not based on Bethe ansatz and it works for both integrable and non-integrable systems.

References:
[1] C.J. Hamer, Phys. Lett. B 82, 75-78 (1979).
[2] G. Gomez-Santos, Phys. Rev. Lett. 70, 3780 (1993).
[3] R.G. Dias, Phys. Rev. B 62, 7791 (2000).

The 32nd International Symposium on Lattice Field Theory (Lattice 2014)
Speaker, 22/06/2014 - 28/06/2014
Venue: Columbia University, New York, US

Talk: Lattice Hamiltonian approach to the Schwinger model
K. Cichy, A. Kujawa-Cichy, M. Szyniszewski

Abstract:
We employ exact diagonalization with strong coupling expansion to the massless and massive Schwinger model. For the massless case, this allows us for a high accuracy continuum limit estimation of the ground state energy and scalar and vector mass gaps with precisions of the order of one part per billion or better. Furthermore, we investigate the chiral condensate and compare our calculations to previous results available in the literature. Oscillations of the chiral condensate which are present while increasing the expansion order are also studied and are shown to be directly linked to the presence of flux loops in the system.

NoWNano Summer Conference 2014
Participant, 09/06/2014 - 11/06/2014
Venue: Cranage Hall, Cheshire, UK

NoWNano Summer Conference 2013
Participant, 17/06/2013 - 20/06/2013
Venue: Cranage Hall, Cheshire, UK


The 34th International Symposium on Lattice Field Theory (Lattice 2016)
Participant, 24/07/2016 – 30/07/2016
Venue: University of Southampton, Southampton, UK

Poster: Fermions with long-range interactions using a matrix-product-states approach
M. Szyniszewski

Abstract:
​The long-range t-V model of fermions on a lattice is known to exhibit a transition between a Luttinger liquid phase and a Mott insulator phase [1]. At insulating densities, one can tailor the potential energy of the model in such a way that one forces a quantum phase transition to either another insulating charge-density-wave phase, a bond-order phase or a Luttinger liquid [2]. We show how to construct a matrix product operator representation of the Hamiltonian of the t-V model and we present phase diagrams calculated using the matrix-product-states approach [3]. We compare these phase diagrams with results obtained in the atomic limit.

References:
[1] G. Gómez-Santos, Phys. Rev. Lett. 70, 3780 (1993).
[2] P. Schmitteckert and R. Werner, Phys. Rev. B 69, 195115 (2004); T. Mishra et al., Phys. Rev. B 84, 115135 (2011).
[3] D. Perez-Garcia et al., Quantum Inf. Comput. 7, 401 (2007); F. Verstraete et al., Adv. Phys. 57, 143 (2008).​
POSTER

NoWNano Summer Conference 2016
Speaker, 27/06/2016 – 30/06/2016​
Venue: Cranage Hall, Cheshire, UK

Talk: Diffusion Monte Carlo study of charge carrier complexes in two-dimensional semiconductors
M. Szyniszewski, E. Mostaani, C. Price, R. Maezono, N. Drummond, V. Fal’ko


N8 HPC Network Event – New approaches to atomistic / quantum simulation of materials
Speaker, 08/01/2016
Venue: The Bar Convent, York, UK

Talk: Diffusion Monte Carlo study of charge carrier complexes in two-dimensional semiconductors
M. Szyniszewski, E. Mostaani, C. Price, R. Maezono, N. Drummond, V. Fal’ko


Psi-k 2015 Conference
Speaker, 06/09/2015 – 11/09/2015
Venue: Kursaal Event Centre, San Sebastian / Donostia, Spain

Talk: Diffusion Monte Carlo study of charge carrier complexes in two-dimensional semiconductors
M. Szyniszewski, E. Mostaani, N. Drummond, V. Fal’ko

Abstract:
We use a novel description of the interaction between charges in two-dimensional (2D) semiconductors to investigate the binding properties of two-, three- and four-particle complexes of charge carriers (excitons, trions and biexcitons). We report binding energies and pair distribution functions calculated using diffusion quantum Monte Carlo methods, which are exact for these systems. Our results will enable the interpretation of experimental photoabsorption and photoluminescence measurements on 2D transition-metal dichalcogenide materials. We show that our data are consistent with previous binding-energy data for the limits in which the interactions between charges reduce to logarithmic and Coulomb (1/r) forms. We find that the logarithmic interaction that has previously been used to study excitons and trions in 2D semiconductors provides an inadequate description of the behaviour of systems such as molybdenum disulphide, and we provide accurate binding-energy data for excitons, trions and biexcitons in these materials.

Grant: IOP Research Student Conference Fund awarded by IOP Computational Physics Group; Psi-k Conference Financial Support.PRESENTATION


The 33rd International Symposium on Lattice Field Theory (Lattice 2015)
Participant, 13/07/2015 – 18/07/2015
Venue: Kobe International Conference Center, Kobe, Japan

Poster: Strong coupling expansion of the t-V model (further results)
M. Szyniszewski, E. Burovski

Abstract:
We employ a strong coupling expansion – similar to the one used in the lattice field theory studies [1] – to solve the one-dimensional extended t-V model of fermions on a lattice [2]. This model is solved for a range of filling factors, including both commensurate – where a charge density wave is present – and incommensurate densities. The first set consists not only of a trivial case of half filling. The method allows us to trace the transition from a Luttinger liquid phase to a Mott insulating phase and calculate the critical parameter K. This simple yet powerful method is not based on Bethe ansatz and it works for both integrable and non-integrable systems. Furthermore, we investigate how tailoring the interaction can introduce other ordered phases of the system [3].

References:
[1] C.J. Hamer, Phys. Lett. B 82, 75-78 (1979); D.P. Crewther, C.J. Hamer, Nucl. Phys. B 170, 353-368 (1980).
[2] G. Gómez-Santos, Phys. Rev. Lett. 70, 3780 (1993); R.G. Dias, Phys. Rev. B 62, 7791 (2000).
[3] P. Schmitteckert, R. Werner, Phys. Rev. B 69, 195115 (2004); T. Mishra et al., Phys. Rev. B 84, 115135 (2011).
POSTER

Tensor Network Summer School 2015
Participant, 01/06/2015 – 05/06/2015
Venue: Ghent University, Ghent, Belgium

Topics:
– matrix product states (MPS)
– projected entangled pair states (PEPS)
– multiscale entanglement renormalization ansatz (MERA)

Travel grant: Lancaster University Graduate School Travel Grant GSTG-15-76.


International Conference on Strongly Correlated Electron Systems 2014
Participant, 07/07/2014 – 11/07/2014
Venue: Campus Saint Martin d’Hères, Grenoble, France

Poster: Generalised t-V model in one dimension
M. Szyniszewski, E. Burovski

Abstract:
We use a strong coupling expansion [1] to solve the one-dimensional extended t‑V model of fermions [2,3]. The model is solved for a range of densities, including both commensurate – where a charge density wave is present – and incommensurate densities. The first set consists not only of a trivial case of half filling. The method allows us to trace the transition from a Luttinger liquid phase to a Mott insulating phase. This simple yet powerful method is not based on Bethe ansatz and it works for both integrable and non-integrable systems.

References:
[1] C.J. Hamer, Phys. Lett. B, 82, 75-78 (1979).
[2] G. Gómez-Santos, Phys. Rev. Lett., 70, 3780 (1993).
[3] R.G. Dias, Phys. Rev. B, 62, 7791 (2000).
POSTER

Travel grant: Lancaster University Graduate School Travel Grant GSTG-14-26.

Picture

The 32nd International Symposium on Lattice Field Theory (Lattice 2014)
Speaker, 22/06/2014 – 28/06/2014
Venue: Columbia University, New York, US

Talk: Lattice Hamiltonian approach to the Schwinger model
K. Cichy, A. Kujawa-Cichy, M. Szyniszewski

Abstract:
We employ exact diagonalization with strong coupling expansion to the massless and massive Schwinger model. For the massless case, this allows us for a high accuracy continuum limit estimation of the ground state energy and scalar and vector mass gaps with precisions of the order of one part per billion or better. Furthermore, we investigate the chiral condensate and compare our calculations to previous results available in the literature. Oscillations of the chiral condensate which are present while increasing the expansion order are also studied and are shown to be directly linked to the presence of flux loops in the system.
PRESENTATION


NoWNano Summer Conference 2014
Participant, 09/06/2014 – 11/06/2014
Venue: Cranage Hall, Cheshire, UK
POSTER

NoWNano Summer Conference 2013
Participant, 17/06/2013 – 20/06/2013
Venue: Cranage Hall, Cheshire, UKPOSTER

Outreach Events

British Science Week
Organiser, 18/03/2015
Sackville Street Building, University of Manchester

Activities:

  • making graphene and playing with models of carbon materials
  • crystallography: how a shadow of a 3D shape can change depending on the angle
Science Spectacular
Organiser, 25/10/2014
Whitworth Hall / Museum, University of Manchester

Activities:

  • making graphene
  • crystallography: making shapes and looking at their shadows
National Science and Engineering Week
Organiser, 21/03/2014
Sackville Street Building, University of Manchester

Activities:

  • hydrophobic sand
  • making graphene
Meet the Nanoscientist
Organiser, 09/02/2013
Museum of Science and Industry, Manchester

Activities:

  • hydrophobic sand and coat
  • LEGO magnetic force microscope
  • making graphene
  • ferrofluids