ISSP - The institute for Solid State Physics

Lab & Organization
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Kawashima Group
Professor
KAWASHIMA,
Naoki

Research Associate
MORITA,
Satoshi

To The Group's Homepage

Recently, the trend of artificial intelligence / machine learning / quantum computation has attracted social attention. Our research group tries to clarify the mathematical core of the methods of computational physics and computational statistical mechanics. We are conducting research based on the development of new methods. As its application, we are elucidating unsolved problems in statistical mechanics and performing comparative calculations with experimental studies in strongly correlated quantum systems in which interactions dominate physical properties. The quantum Monte Carlo and tensor network methods used here are closely related to data science through Boltzmann machines and information compression. An example of recent research is the discovery of a simple representation of the wave function of the Kitaev spin liquid state. In the pursuit of expressing the ground state of the Kitaev model by using a tensor network with as little information as possible, recently, we found that it can be essentially expressed by the loop gas model, a model of classical statistical mechanics.

Classical loop-gas at criticality represents the gapless Kitaev spin liquid.

Research Subjects

  1. Search for novel quantum phases and quantum transitions
  2. Numerical methods for many-body physics
  3. General theory of critical phenomena
  4. Disordered systems and computational complexity