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Research Focus

My research endeavors in theoretical condensed matter physics primarily revolve around exploring and elucidating complex phenomena in quantum materials. Key areas of my current research include:

  1. High-Temperature Superconductivity in Cuprates: Investigating the underlying mechanisms that enable superconductivity at temperatures significantly higher than conventional superconductors. This includes a focus on the half-skyrmion theory and its implications in the behavior of high-Tc cuprates. Our research on high-Tc cuprates elucidates several phenomena: the incommensurate peaks in neutron scattering are linked to skyrmion lattice formation; hole doping rapidly disrupts antiferromagnetic order; and ARPES studies reveal the energy dispersion in parent compounds, enhancing our understanding of their electronic structure and superconducting properties.
  2. Dirac Fermions in Organic Conductors: Studying the unique properties of Dirac fermions in organic materials, which could pave the way for novel electronic applications. This involves examining the magnetoresistance effects in these systems. In our research on Dirac fermions, we have made significant contributions to understanding their dimensional behavior in condensed matter systems. We predicted a dimensional crossover from a quasi-two-dimensional Dirac fermion system to a three-dimensional Dirac semimetal state at low temperatures. This theoretical prediction was subsequently validated through experimental observations, which included the detection of negative magnetoresistance and the planar Hall effect. These findings are particularly notable as they confirm the condensed matter physics manifestation of the chiral anomaly.
  3. Quantum Spin Systems: Our research utilizes the equation of motion for the Green’s function to study quantum spin systems, yielding exact results at high temperatures. This method accurately estimates the transition temperature of the three-dimensional antiferromagnetic Heisenberg model, closely matching quantum Monte Carlo simulations. We have applied this technique to analyze the pseudogap phase in cuprate high-temperature superconductors, offering significant insights into their superconducting behaviors.
  4. Simulating Hawking Radiation Using Bose-Einstein Condensates: Exploring the frontiers of quantum simulation by replicating the phenomena of Hawking radiation in a controlled environment using dynamically expanding Bose-Einstein condensates of cold atoms.

Publications

Address

Graduate School of Human and Environmental Studies, Kyoto University, Kyoto 606-8501 JAPAN
Phone: +81-75-753-6780 Fax: +81-75-753-6694
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