Dr Stephen R Clark

MSci, MAST, DPhil / PhD, Postgraduate Diploma

  • BS8 1TL

20042020

Research output per year

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Personal profile

Research interests

Major themes for my research revolve around non-equilibrium phenomena in many-body systems ranging from ultra-cold atoms to strongly correlated electron materials. Specifically, I am interested in:

  • Understanding the nature of entanglement, correlations and quantum mutual information in ground states and thermal states of commonly encountered many-body systems. Such properties have striking and deep connections to the classical simulability of quantum systems.
  • Exploiting and further developing sophisticated tensor network theory techniques for efficiently simulating many-body quantum systems. Currently this most prominently includes the density matrix renormalization group (DMRG) method and its generalization to time-dependent phenomena via the time-evolving block decimation (TEBD) algorithm applicable to 1D systems. A major long term effort to extend the success of these methods to 2D quantum systems is underway.
  • Developing a comprehensive and highly optimised freely available open-source software library for tensor network theory algorithms which can be found at www.tensornetworktheory.org.
  • Connecting tensor network theory to enahnce other extremely successful techniques in condensed matter physics, such as variational Monte Carlo and dynamical mean-field theory.
  • Applying these toolbox of methods to strongly driven systems to determine how its properties can be controlled on ultra-short timescales, and on longer timescales if it can be stably pushed into new phases not accessible thermally.
  • Exploring foundational issues regarding quantum theory including non-locality and quantifying quantumness, as well as connections to thermodynamics of small systems and fluctuation relations.

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Projects

Research Output

  • 68 Article (Academic Journal)
  • 4 Conference Contribution (Conference Proceeding)
  • 1 Chapter in a book
  • 1 Review article (Academic Journal)

Controllable Finite-Momenta Dynamical Quasicondensation in the Periodically Driven One-Dimensional Fermi-Hubbard Model

Cook, M. W. & Clark, S. R., 9 Mar 2020, In : Physical Review A. 101, 3, 17 p., 033604.

Research output: Contribution to journalArticle (Academic Journal)

Open Access
File
  • 45 Downloads (Pure)

    Excitonic and lattice contributions to the charge density wave in 1T-TiSe2 revealed by a phonon bottleneck

    Hedayat, H., Sayers, C. J., Bugini, D., Dallera, C., Wolverson, D., Batten, T., Karbassi, S., Friedemann, S., Cerullo, G., Wezel, J. V., Clark, S. R., Carpene, E. & Como, E. D., 12 Apr 2020, (Accepted/In press) In : Physical Review Research. 1, 11 p., 023029.

    Research output: Contribution to journalArticle (Academic Journal)

    Open Access
    File
  • 143 Downloads (Pure)

    Parallel time-dependent variational principle algorithm for matrix product states

    Secular, P., Gourianov, N., Lubasch, M., Dolgov, S., Clark, S. R. & Jaksch, D., 5 Jun 2020, In : Physical Review B. 101, 235123.

    Research output: Contribution to journalArticle (Academic Journal)

    Open Access
    File