Angle-resolved photoemission spectra in one-dimensional Hubbard-Holstein model  

作　　者：SUN Peijian HUAI Ping ZHANG Wei CHENG Cheng ZHU Zhiyuan 

机构地区：[1]Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China [2]Graduate University of Chinese Academy of Sciences, Beijing 100049, China

出　　处：《Nuclear Science and Techniques》2011年第5期299-303,共5页核技术（英文）

基　　金：Supported by National Basic Research Program of China Grant No.2010CB934504;National Natural Science Foundation of China Grant Nos.10874197, 10905040;the CAS Hundred Talents Program

摘　　要：In order to understand the effects of electron-phonon coupling and Coulomb interactions in angle-resolved photoemission spectroscopy(ARPES),a spin-1/2 Hubbard-Holstein model at half-filling is theoretically investigated by means of the mean field theory and classical Monte Carlo simulation method.It shows that the spectral shape of the one-dimensional system is significantly modified by the electron-phonon coupling and Coulomb interactions.The suppression of charge-density wave in one-dimensional system has been ascribed to the short-range Coulomb repulsion and thermal lattice fluctuations.The competition between these interactions can induce zero energy gaps in APPES as well as complete cancellation of charge or spin ordering.In order to understand the effects of electron-phonon coupling and Coulomb interactions in angle-resolved photoemission spectroscopy （ARPES）, a spin-I/2 Hubbard-Holstein model at half-filling is theoretically investigated by means of the mean field theory and classical Monte Carlo simulation method. It shows that the spectral shape of the one-dimensional system is significantly modified by the electron-phonon coupling and Coulomb interactions. The suppression of charge-density wave in one-dimensional system has been ascribed to the short-range Coulomb repulsion and thermal lattice fluctuations. The competition between these interactions can induce zero energy gaps in APPES as well as complete cancellation of charge or spin ordering.

关 键 词：角分辨光电子能谱 一维模型 库仑相互作用 声子耦合 一维系统 平均场理论 电荷密度波 模拟方法 

分 类 号：O53[理学—等离子体物理] TM262[理学—物理]