Abstract
The skyrmion formation mechanism in centrosymmetric systems remains to be understood, partially because of the lack of fundamental understanding of the electronic structure. The authors observe de Haas--van Alphen and Shubnikov--de Haas oscillations in high magnetic fields up to 58 $T$ on GdRu${}_{2}$Si${}_{2}$, which is one of such centrosymmetric skyrmion-hosting magnets with the shortest skyrmion diameter ever found. Combined with first-principles calculations, the authors now reveal the electronic structure of GdRu${}_{2}$Si${}_{2}$ and its reconstruction at the magnetic phase boundary.
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