6 papers
Quantics tensor cross interpolation for high-order strong-coupling expansions
Kanghyeon Kim, Lei Geng, Philipp Werner +1
Real-time impurity solvers enable the study of transport phenomena and the description of nonequilibrium lattice systems within the framework of dynamical mean-field theory (DMFT).…
Nonperturbative Nonlinear Hall Effect in Nonequilibrium Steady States
Lei Geng, Martin Eckstein, Lei Chen +4
The nonlinear Hall effect in quantum materials has attracted broad interest, yet most existing studies focus on the weak-field, perturbative regime. Here we develop a nonperturbati…
-pairing in metallic and particle-hole asymmetric systems
Philipp Werner, Aaram J. Kim, Lei Geng
Light-induced superconducting-like states have been reported in several classes of correlated materials. From a theoretical point of view, the induction of -pairing is a promis…
High-temperature -pairing superconductivity in the photodoped Hubbard model
Lei Geng, Aaram J. Kim, Philipp Werner
We investigate superconductivity emerging in the photodoped Mott insulating Hubbard model using steady-state dynamical mean-field theory implemented on the real-frequency axis. By…
Third-order strong-coupling impurity solver for real-frequency DMFT: Accurate spectral functions for antiferromagnetic and photo-doped states
Lei Geng, Aaram J. Kim, Philipp Werner
We present a real-frequency third-order strong-coupling impurity solver which employs quantics tensor cross interpolation (QTCI) for an efficient evaluation of the diagram weights.…
Photoinduced excitonic magnetism in a multiorbital Hubbard system
Lei Geng, Sujay Ray, Philipp Werner
Multiorbital Hubbard models with Hund coupling and crystal-field splitting exhibit an instability toward spin-triplet excitonic order in the parameter regime characterized by stron…