Role of Ga-doping in ironben gallium alloy clusters

The structural and magnetic properties of Fe_n-mGa_m (n=3～6, m=0～2; n=13, m=0～3) alloy clusters have been studied using density functional theory. The substitutional doping is favourable for small clusters with up to six atoms at low Ga concentration and substitutional Ga atoms in 13-atom clusters prefer surface sites. The Ga-doping generally could reduce the energetic stability but enhance the electronic stability of Fe clusters, along with a decrease of the local magnetic moments of Fe atoms around Ga dopants. These findings provide a microscopic insight into Fe-Ga alloys which are well-known magnetostriction materials.     

Role of Ga-doping in iron-gallium alloy clusters

The structural and magnetic properties of Fe_n-m Ga_m （n=3 ～ 6,m=0 ～ 2;n=13,m=0 ～ 3） alloy clusters have been studied using density functional theory.The substitutional doping is favourable for small clusters with up to six atoms at low Ga concentration and substitutional Ga atoms in 13-atom clusters prefer surface sites.The Ga-doping generally could reduce the energetic stability but enhance the electronic stability of Fe clusters,along with a decrease of the local magnetic moments of Fe atoms around Ga dopants.These findings provide a microscopic insight into Fe-Ga alloys which are well-known magnetostriction materials.     

量子材料的弗洛凯调控

基于光-物质强相互作用的弗洛凯调控有望在超快时间尺度上驱动量子材料进入非平衡态,进而调控它们的电子结构和物理特性,实现平衡态所不具有的新奇物理效应.近年来,弗洛凯调控备受研究人员关注,理论方面已有大量丰富的预言;实验方面,拓扑绝缘体、石墨烯、黑磷等几个代表性材料的弗洛凯调控也取得了一些重要的研究进展.本文简略介绍该领域取得的理论和实验方面的重要进展,并对研究前景、实验挑战及发展方向进行展望.