Real-time dynamics of spinons and holons in one-dimensional correlated electron systems

一次元強相関電子系におけるスピノン・ホロンの実時間ダイナミクス

大西 弘明  ; Gonzalez, I.*; Melko, R.*; Dagotto, E.*

Onishi, Hiroaki; Gonzalez, I.*; Melko, R.*; Dagotto, E.*

To clarify the property of spin-charge separation in correlated electron systems, we study the real time evolution of wavepackets carrying spinons and holons in a one-dimensional Hubbard model, using the time-dependent density-matrix renormalization group method. In the bulk, while spinons and holons move with the same velocity in the non-interacting chain, it is observed that in the interacting Mott insulator they move in opposite directions each with its own individual velocity. Thus, spin-charge separation is clearly observed. On the other hand, when the Mott insulator is connected to a non-interacting chain, the wavepackets created in the Mott insulator moving toward the non-interacting region exhibit interesting reflection and transmission properties at the interface between the two regions, that will also be discussed in this presentation.