Charge-spin-orbital dynamics of one-dimensional two-orbital Hubbard model

一次元二軌道ハバード模型の電荷・スピン・軌道ダイナミクス

大西 弘明  

Onishi, Hiroaki

We study the real-time evolution of excited states in a one-dimensional two-orbital Hubbard model, by a time-dependent density-matrix renormalization group method. When we consider orbitals along the direction, electrons can hop only between 3- orbitals due to the spatial anisotropy of the orbital shape. In such a case, creating a hole into the ground state, we observe that wavepackets of the spin density and the charge density propagate in opposite directions with its own individual velocity. Thus, the spin-charge separation is clearly observed. We will discuss the propagation of wavepackets of various types of excited states that possess hole, holon-doublon, magnon, and orbiton.