ISSP - The institute for Solid State Physics

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Matsunaga Group
Associate Professor
MATSUNAGA,
Ryusuke

Research Associate
KANDA,
Natsuki

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We investigate light-matter interactions and light-induced nonequilibrium phenomena in materials by utilizing terahertz wave, infrared, visible, and ultraviolet coherent light sources based on ultrafast pulsed laser technology. Especially terahertz spectroscopy can unveil low-energy responses of materials on the order of millielectronvolts which include essential information for dynamical motions of electron, phonon, or spin degrees of freedom in condensed matter physics. Recently-developed intense terahertz pulse generation technique has also opened a new pathway toward optical control of materials by strong resonant or off-resonant excitation. In addition to the development of terahertz generation and detection technique and novel nonlinear spectroscopy scheme, we will contribute on the study for cooperative behaviors in many-body systems like superconductivity or antiferromagnetism and seek hidden transient phases of matters in nonequilibrium system to reveal the functionality of materials.

Regenerative-amplified femtosecond pulse laser system for intense terahertz wave generation and phase-locked mid-infrared light generation
Transmission, reflection, and polarization rotation spectroscopy system for terahertz electromagnetic response and Hall conductivity measurements

Research Subjects

  1. Development of intense, phase-locked terahertz-mid infrared pulse generation and detection
  2. Study of collective excitations and response functions in superconductivity and antiferromagnetism
  3. Nonequilibrium dynamics of many-body systems driven by strong light field