摘要
文章计算了含有三种跃迁项(最近邻(NN)、次近邻(NNN)、次次近邻(NNNN)跃迁项)的扩展Su-Schrieffer-Heeger(SSH)模型(模型ⅰ)的热力学特性.对仅含有二种跃迁项(NN、NNN跃迁项)的扩展SSH模型(模型ⅱ)、仅含有一种跃迁项(NN跃迁项)的SSH模型(模型ⅲ)也作了类似的计算.在低温下,每个模型都有相变且跃迁项的存在会降低相变温度.由于NNN跃迁项的存在,在极低温条件下,关于热容量与温度比(HCOTR)随温度变化的单调性,模型i与其它两个模型存在差异.在低温下,模型ⅰ的HCOTR的单调性,会受NN或NNN或NNNN跃迁项的影响并且NN或NNN跃迁项会影响其相变.
The thermodynamic properties of the extended Su-Schrieffer-Heeger(SSH) model with nearest-neighbor(NN), next-nearest-neighbor(NNN), and next-next-nearest-neighbor(NNNN) hopping terms are calculated. Similar calculations are implemented for the extended SSH model with both NN and NNN hopping terms and the SSH model with only NN hopping term. At low temperatures, every model has a phase transition and transition temperature can be decreased by hopping terms. At extremely low temperatures, there are differences between the monotonicity of heat capacity over temperature ratio(HCOTR) for extended SSH model with NN, NNN, and NNNN hopping terms and those for the other two models, which can be attributed to the NNNN hopping terms. At low temperatures, the monotonicity of HCOTR for extended SSH model with NN, NNN, and NNNN hopping terms can be affected by the NN or NNN or NNNN hopping terms and the phase transitions of this model can be affected by the NN or NNN hopping terms.
作者
尹传磊
朱学峰
杨非凡
李蓉
周毅坚
彭文博
赵洋
YIN Chuan-Lei;ZHU Xue-Feng;YANG Fei-Fan;LI Rong;ZHOU Yi-Jian;PENG Wen-Bo;ZHAO Yang(Henan Key Laboratory of Photoelectric Energy Storage Material and Applications,School of Physics and Engineering,Henan University of Science&Technology,Luoyang 471023,China)
出处
《原子与分子物理学报》
CAS
北大核心
2022年第3期98-104,共7页
Journal of Atomic and Molecular Physics
基金
国家自然科学基金(11504091,61674052,11404097)
河南省教育厅基金(15A140021)
河南省优秀青年科学基金(212300410041)
河南省高等学校青年骨干教师培养对象项目(2018GGJS054)
河南省科技攻关项目(212102210223)
河南省高等学校重点科研基金(20A140012)
河南科技大学大学生研究训练计划(SRTP)(2020180,2020187)。
