We are searching for non-perturbative magnetic field effects, such as large changes not only in the electronic state but also in the crystal structure, using ultra-high magnetic fields. However, in solids, the energy scale can be effectively enhanced due to the competing nature of the various interactions. For example, an insulator such as VO₂ has an energy gap on the order of 1 eV, but it undergoes a phase transition from insulator to metal at magnetic fields of 200~300 T. On the other hand, the key to understanding this phase transition is the picture of the destabilization of the V-V molecular orbitals formed in the dimer of V atoms by a magnetic field. The phenomenon of the breakdown of molecules in solids in a magnetic field is expected to be similar in mechanism to the breakdown of molecules such as H₂ that occurs in the huge magnetic field of the universe (about 10⁵ T). In addition, we are searching for novel phenomena caused by non-perturbative magnetic field effects in a variety of other objects in ultra-high magnetic fields.

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