Nonequilibrium control of electronically ordered hidden phases may lead to the development of ultrafast switches and memory devices. In this study, we demonstrate tunable hidden orders in the photo-doped two-orbital extended Hubbard model. Using steady-state nonequilibrium dynamical mean field theory, we clarify the coexistence and interplay of nonthermal charge, spin, and orbital order. The hidden state at low effective temperature and sufficiently high photo-doping is reminiscent of Kugel-Khomskii order in the two-orbital Hubbard model at $\frac{ 1}{ 4}$ and $\frac{ 3}{ 4}$ filling, but it emerges out of a nonequilibrium charge ordered state and exhibits a different magnetic structure. A low-energy effective Hamiltonian is used to analyze the exchange processes which stabilize the nonthermal order.
Categories: cond-mat.str-el physics.comp-ph