Excitonic wave-packet evolution in a two-orbital Hubbard model chain: A real-time real-space study

Motivated by experimental developments introducing the concept of spin-orbit separation, we study real-space time evolution an excitonic wave-packet using a two-orbital Hubbard model. The exciton is created exciting electron from lower energy half-filled orbital to higher empty orbital. We carry out real-time dynamics resulting wave-packet, time-dependent density matrix renormalization group method. find clear evidence charge-spin and separation in real-space, tracking local observables. show that velocity orbiton can be tuned varying inter-orbital interactions. also present comparative hole (in one orbital) two orbitals) one-dimensional systems. Moreover, analyze with spin-flip excitation, where observe fractionalized spinons induced Hund's interaction.