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Showing 1–5 of 5 results
Advanced filters: Author: Andrey A. Bagrov Clear advanced filters

  • Thermal fluctuations associated with higher temperatures normally destroy long-range order, but in some circumstances they can stabilize new ordered phases. This ‘order by disorder’ phenomenon has now been observed in the magnetic phases of neodymium.

    • Benjamin Verlhac
    • Lorena Niggli
    • Alexander A. Khajetoorians
    ResearchOpen Access
    Nature Physics
    Volume: 18, P: 905-911

  • Quantum fractals offer a clean route to unconventional states between a metal and an insulator. In a disorder-free Sierpiński gasket lattice, the authors characterise the emergence of non-ergodic multifractal states, predict experimental signatures, and suggest pathways toward precise quantum control.

    • Fabio Salvati
    • Mikhail I. Katsnelson
    • Andrey A. Bagrov
    ResearchOpen Access
    Communications Physics
    Volume: 9, P: 1-10

  • Neural network representations of quantum states are hoped to provide an efficient basis for numerical methods without the need for case-by-case trial wave functions. Here the authors show that limited generalization capacity of such representations is responsible for convergence problems for frustrated systems.

    • Tom Westerhout
    • Nikita Astrakhantsev
    • Andrey A. Bagrov
    ResearchOpen Access
    Nature Communications
    Volume: 11, P: 1-8

  • The complexity of many-body sign structures is one of the major issues that severely limits the applicability of variational and quantum Monte Carlo algorithms for calculating properties of quantum many-body systems. Here, the authors propose a method to find the sign structure of frustrated quantum spin systems based on the premise that the amplitude and signs of the wave function can be separated and the latter reconstructed using combinatorial optimization.

    • Tom Westerhout
    • Mikhail I. Katsnelson
    • Andrey A. Bagrov
    ResearchOpen Access
    Communications Physics
    Volume: 6, P: 1-10