by Wei-Cheng Lee and Congjun Wu

We study the Fermi surface instability of the Pomeranchuk type in orbital band systems. Band hybridization significantly enhances the Landau interactions in non-$s$-wave channels and results in anisotropic (nematic) Fermi surface distortions.The Ginzburg-Landau free energy is constructed by coupling the charge-nematic, spin-nematic and ferromagnetic order parameters together, which shows that nematic electron states can be induced by metamagnetism.The connection between this mechanism to the anisotropic states observed in Sr₃Ru₂O₇ at high magnetic fields is studied in a multi-band Hubbard model with the hybridized quasi-one dimensional d_xz and d_yz-bands.