Orbital Selectivity from Orbital Ordering in a van Hove Singularity Hubbard Model

We explore the electronic state of a van Hove singularity two-orbital model, showing the emergence of orbital selectivity arising from ferro-orbital ordering (FOO). Our microscopic description highlights the role of orbital degrees of freedom in realizing orbital selectivity with coexistent quasiparticle resonances and Mott-localized electronic states. This allows us to identify the emergent paramagnetic electronic state that gives rise to spontaneous formation of altermagnetism from electron interactions and orbital ordering. We also show why our DMFT results might be important for understanding the implications of FOO for memristors for future neuromorphics.