| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Magnetic flux transitions in two-band single-junction superconductors with time-reversal symmetry breaking |
| Guo Wang(王果)1, Tian-Yi Han(韩天意)1, and Hai Huang(黄海)2,† |
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 |
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Abstract 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.
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Received: 11 October 2024
Revised: 15 December 2024
Accepted manuscript online:
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PACS:
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74.20.De
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(Phenomenological theories (two-fluid, Ginzburg-Landau, etc.))
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74.20.Rp
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(Pairing symmetries (other than s-wave))
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74.20.-z
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(Theories and models of superconducting state)
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Corresponding Authors:
Hai Huang
E-mail: huanghai@ncepu.edu.cn
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Cite this article:
Guo Wang(王果), Tian-Yi Han(韩天意), and Hai Huang(黄海) Magnetic flux transitions in two-band single-junction superconductors with time-reversal symmetry breaking 2025 Chin. Phys. B 34 037401
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