Magnetic flux transitions in two-band single-junction superconductors with time-reversal symmetry breaking  

作　　者：Guo Wang Tian-Yi Han Hai Huang 王果;韩天意;黄海

机构地区：[1]School of Nuclear Science and Engineering,North China Electric Power University,Beijing 102206,China [2]Department of Mathematics and Physics,North China Electric Power University,Beijing 102206,China

出　　处：《Chinese Physics B》2025年第3期521-525,共5页中国物理B(英文版)

摘　　要：Based on Ginzburg-Landau theory,we investigate the electromagnetic properties of two-band superconductors with broken time-reversal symmetry.We propose an apparatus of a superconducting ring integrated with a microbridge structure to probe the peculiar topological excitations in the chiral system.The phase difference of two order parameters in the superconductor satisfies the double sine-Gordon equation,and a linear relationship between the phase difference at the two ends of the junction and the total magnetic flux in the ring can be obtained.Then with the Josephson current-phase relation,we establish the dependence of the circulating current and magnetic flux on the applied external magnetic field.Our results show that this single-junction system will exhibit the irreversible behaviors and two different types of fractional flux transitions can clearly manifest the time-reversal symmetry breaking in two-component superconductors.

关 键 词：two-band superconducting ring microbridge double sine-Gordon equation fractional magnetic flux 

分 类 号：O17[理学—数学]