Electronic phase conversion by photoinjection of excitations
Electronic phase conversion by photoinjection of excitations
复制标题
通过激发光注入进行电子相位转换
DOI：
10.1103/physrevb.61.12101
复制
发表时间：
2000
影响因子：
3.7
通讯作者：
T. Ogawa
中科院分区：
文献类型：
--
作者：
K. Koshino;T. Ogawa
利用双稳电子唯象模型和修正的Hubbard模型，从理论上讨论了电子相互作用引起的光致电子相变。我们主要研究了光激发进入多稳态电子系统的一个亚稳态后的动力学。当注入少量的激发时，它们只会引起电子态的微小振荡。另一方面，当注入比阈值更大的激发量时，它们成功地诱导了电子态的大振荡，我们可以认为这是相变。阐明了诱导相变的条件；当两个电子态在初始亚稳态时混合很大时，可以通过少量光注入激发来诱导相变。
We theoretically discuss the photoinduced electronic phase conversion mediated by the electronic interactions, using a phenomenological model of bistable electrons and the modified Hubbard model. We focus on the dynamics after photoexcitation into one of the ~meta!stable states of the multistable electronic systems. When small amount of excitations are injected, they merely induce small oscillations in the electronic states. On the other hand, when larger amounts of excitations than a threshold value are injected, they successfully induce large oscillations in the electronic states, which we can regard as the phase conversions. Conditions for induction of the phase conversion are clarified; such induction by photoinjection of a small amount of excitations is possible when the mixing of the two electronic states is large in the initial ~meta!stable state.