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Evolution and Instability of Bogoliubov Fermi Surfaces under Zeeman Field
No full textWe theoretically investigate the evolution and instability of the Bogoliubov Fermi surface (BFS) in the spherical j = 3=2 model under a Zeeman field. The applied field induces a pronounced expansion in the BFS with jz = ±3=2 component. Such behavior can be detected by spectroscopic techniques such as angle-resolved photoemission spectroscopy (ARPES). Interestingly, the Pauli susceptibility exhibits behavior that appears discontinuous just below the transition temperature at zero field, even though it is a second-order transition. This is due to spontaneous magnetization. Furthermore, the analysis of the bogolon correlations in the superconducting phase suggests the possibility of the chiral p- or f-wave bogolon pairing instabilities rather than the Pomeranchuk instability. These chiral states coexist with the chiral d-wave superconducting state, spontaneously break inversion symmetry, and lead to the disappearance of the torus-shaped BFS structure. ©2025 The Physical Society of Japan.journal articl
