AI 中文总结
研究平面磁场下双层超导薄膜有限温度相变，零温有PT相变，有限温度下紧凑性分离缺陷机制，C-IC边界是PT孤子进入线，热熔化类似BKT，约瑟夫森锁定影响不同态的涡旋及熔化。
AI 中文摘要
我们研究了在平面磁场下具有紧凑层相的约瑟夫森耦合双层超导薄膜中的有限温度相变。在零温度下，相对相位扇区经历从相称的Fulde-Ferrell（C/FF）态到不相称的布洛赫超导（IC/Bloch SC）态的Pokrovsky-Talapov（PT）相称-不相称（C-IC）转变。在有限温度下，紧凑性分离了两种不同的缺陷机制。C-IC边界仍然是PT孤子进入线，热熔化是类似Berezinskii-Kosterlitz-Thouless（BKT）的，且活跃涡旋通道在相图中变化。约瑟夫森锁定抑制了C/FF态中的基本层涡旋并选择了同涡度层对BKT通道，而基本层涡旋控制IC/Bloch SC态的熔化。
英文摘要
We study finite-temperature phase transitions in a Josephson-coupled bilayer superconducting film with compact layer phases under an in-plane magnetic field. At zero temperature, where thermally excited layer vortices are absent, the relative-phase sector undergoes a Pokrovsky--Talapov (PT) commensurate--incommensurate (C--IC) transition from a commensurate Fulde--Ferrell (C/FF) state to an incommensurate Bloch superconducting (IC/Bloch SC) state. At finite temperature, compactness separates two distinct defect mechanisms. The C--IC boundary remains a PT soliton-entry line: interlayer Josephson vortex--antivortex-pair solitons enter with the square-root onset $ρ_{\rm sol}\propto [k_0-k_0^c(T)]^{1/2}$. Thermal melting is instead Berezinskii--Kosterlitz--Thouless (BKT)-like, with correlation exponent $η=1/4$ at the boundary, but the active vortex channel changes across the phase diagram. Josephson locking suppresses elementary layer vortices in the C/FF state and selects a same-vorticity layer-pair BKT channel, whereas elementary layer vortices control melting of the IC/Bloch SC state.
