A Mean-field Calculation for the Three-Dimensional Holstein Model

A path integral representation appropriate for further Monte Carlo simulations is derived for the electron-phonon Holstein model in three spatial dimensions. The model is studied within mean-field theory. Charge density wave and superconducting phase transitions are discussed.Comment: Latex file typeset using elsart.cls, 16 pages, 2 figures, submitted to Journal of Physics: Condensed Matte

Understanding Usage Intention of Social Media’s Innovative Functions: Based on Expanded Innovation Diffusion Theory

Drawing upon expanded innovation diffusion theory (IDT), this study investigates the social media users’ usage intention toward its innovative functions. 532 data were collected from the Chinese leading social media—WeChat. The results show that the relative advantage, ease of use, trialability, observability, subjective norm and image have positive effect on users’ usage intention. Whereas compatibility has no significant impact. Based upon these findings, we discussed the theoretical contributions and practical implication of this study

Understanding WeChat User’s Intention to Use Various Functions: from Social Cognitive Perspective

Based upon social cognitive theory, this study explores the effect of personal and environment factors on Wechat user’s continuous intention to use various functions. Online survey is used to collect data from the WeChat users. The results confirms that some personal factors (relationship benefit and performance benefit) have a positive effect on intention to use, while image does not have significant effect. Besides, three social environmental factors, the popularity of WeChat, subjective norm and company guarantee, all have significant impacts. Furthermore, we find that environmental factors’ effects are stronger than personal factors. Finally, we propose our theoretical and practical implications according to the findings of this study