Orbital Order and Orbital Excitations in Degenerate Itinerant Electron Systems

作     者：卢峰 宋筠 陈东猛 邹良剑 

作者机构：Key Laboratory of Materials Physics Institute of Solid State Physics Chinese Academy of Sciences PO Box 1129 Hefei 230031 Graduate School of the Chinese Academy of Sciences Beijing 100190 Department of Physics Beijing Normal University Beijing 100875 College of Physics Science and Technology China University of Petroleum Dongying 257061 

出 版 物：《Chinese Physics Letters》 (中国物理快报（英文版）)

年 卷 期：2009年第26卷第9期

页      面：243-246页

核心收录：

学科分类：080705[工学-制冷及低温工程] 080903[工学-微电子学与固体电子学] 07[理学] 0809[工学-电子科学与技术（可授工学、理学学位）] 070205[理学-凝聚态物理] 08[工学] 0807[工学-动力工程及工程热物理] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0704[理学-天文学] 0702[理学-物理学] 

主　　题：sea surface nonliear interaction numerical method 

摘      要：We present a theory of orbital ordering in orbital-degenerate itinerant electron systems. The orbital instability in a two-orbital degenerate Hubbard model is investigated in the random phase approximation （RPA）. After demonstrating the criteria for the formation of orbital ordering or the orbital density wave ordering, we find that the orbital and the spin-orbital collective excitation spectra in the ferro-orbital ordered phase exhibit finite gaps. The possible application of the present theory in orbital-ordered 4d compounds is also discussed.