Exact surface energy and elementary excitations of the XXX spin-1/2 chain with arbitrary non-diagonal boundary fields  

作　　者：董家生 路鹏程 孙佩 乔艺 曹俊鹏 郝昆 杨文力 Jia-Sheng Dong;Pengcheng Lu;Pei Sun;Yi Qiao;Junpeng Cao;Kun Hao;Wen-Li Yang(Institute of Modern Physics,Northwest University,Xi'an 710127,China;Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China;School of Physics,Northwest University,Xi'an 710127,China;Peng Huanwu Center for Fundamental Theory,Xi'an 710127,China;Shaanxi Key Laboratory for Theoretical Physics Frontiers,Xi'an 710127,China;School of Physical Sciences,University of Chinese Academy of Sciences,Beijing 100049,China;Songshan Lake Materials Laboratory,Dongguan 523808,China)

机构地区：[1]Institute of Modern Physics,Northwest University,Xi'an 710127,China [2]Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China [3]School of Physics,Northwest University,Xi'an 710127,China [4]Peng Huanwu Center for Fundamental Theory,Xi'an 710127,China [5]Shaanxi Key Laboratory for Theoretical Physics Frontiers,Xi'an 710127,China [6]School of Physical Sciences,University of Chinese Academy of Sciences,Beijing 100049,China [7]Songshan Lake Materials Laboratory,Dongguan 523808,China

出　　处：《Chinese Physics B》2023年第1期483-492,共10页中国物理B（英文版）

基　　金：financial supports from the National Key R&D Program of China (Grant No.2021YFA1402104);the National Natural Science Foundation of China (Grant Nos.12074410,12047502,12147160,11934015,11975183,and 11947301);Major Basic Research Program of Natural Science of Shaanxi Province,China (Grant Nos.2021JCW-19 and 2017ZDJC-32);Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No.XDB33000000);Double First-Class University Construction Project of Northwest University;the fellowship of China Postdoctoral Science Foundation (Grant Nos.2020M680724 and 2022M712580)。

摘　　要：We study the physical properties of the XXX spin-1/2 chain with arbitrary non-diagonal boundary fields. By using a combination of numerical analysis and analytical method, we obtain the surface energy and elementary excitations of the model. It shows that the contributions of the two boundary fields to the surface energy are additive. We also find that there exists a kind of excitations related to the boundary string.

关 键 词：quantum spin chain integrable systems Bethe ansatz 

分 类 号：O469[理学—凝聚态物理]