Collapses-revivals phenomena induced by weak magnetic flux in diamond chain  

作　　者：Na-Na Chang Wen-Quan Jing Yu Zhang Ai-Xia Zhang Ju-Kui Xue Su-Peng Kou 常娜娜;景文泉;张钰;张爱霞;薛具奎;寇谡鹏(Department of Physics,Beijing Normal University;College of Physics and Electronics Engineering,Northwest Normal University)

机构地区：[1]Department of Physics,Beijing Normal University,Beijing 100875,China [2]College of Physics and Electronics Engineering,Northwest Normal University,Lanzhou 730070,China

出　　处：《Chinese Physics B》2020年第1期148-155,共8页中国物理B（英文版）

基　　金：Project supported the National Natural Science Foundation of China(Grant Nos.11974053,11674026,11274255,11305132,and 11475027);China Scholarship Council(CSC)

摘　　要：We investigate the quantum dynamical behaviors of bosons in a diamond chain with weak magnetic flux(WMF),including Landau–Zener tunnelling,Bloch oscillations,localization phenomenon,and collapses-revivals phenomena.We observed that collapses-revivals phenomena can occur in diamond chain with WMF and cannot exist in the strong magnetic flux case as the previous study(Chang N N and Xue J K,2018,Chin.Phys.B 27105203).Induced by WMF,the energy band for the system varies from gapless to gapped structure.The position of the extrema of probability amplitude for ground state can also be altered by WMF within a single diamond plaquette.As a consequence,the transitions between different dynamical behaviors of bosons in diamond chain can be manipulated by WMF,depending on its initial configurations.We investigate the quantum dynamical behaviors of bosons in a diamond chain with weak magnetic flux(WMF),including Landau–Zener tunnelling, Bloch oscillations, localization phenomenon, and collapses-revivals phenomena. We observed that collapses-revivals phenomena can occur in diamond chain with WMF and cannot exist in the strong magnetic flux case as the previous study(Chang N N and Xue J K, 2018, Chin. Phys. B 27 105203). Induced by WMF, the energy band for the system varies from gapless to gapped structure. The position of the extrema of probability amplitude for ground state can also be altered by WMF within a single diamond plaquette. As a consequence, the transitions between different dynamical behaviors of bosons in diamond chain can be manipulated by WMF, depending on its initial configurations.

关 键 词：collapses-revivals phenomena Bloch oscillations Landau–Zener tunneling localization phenomenon flat band 

分 类 号：O413[理学—理论物理]