双层超导体中T_c以上的无耗散反向流电流
Dissipationless counterflow currents above T_c in bilayer superconductors
AI总结：
本研究基于 semiclassical U(1) 格点规范理论，发现双层超导体在临界温度 $T_c$ 以上，尽管均匀面内电流因涡旋增殖而耗散，但双层内反向流动的反向流电流仍保持无耗散，为双层铜氧化物赝能隙相提供了理论解释。
摘要：
我们报告了在双层超导体中临界温度$T_c$以上存在无耗散电流，假设超导相变由相位涨落主导。使用半经典$U(1)$格点规范理论，我们证明热涨落导致从低温超导态到$T_c$以上电阻态的转变，伴随着未束缚涡旋的增殖。值得注意的是，虽然涡旋激发的增殖导致均匀面内电流的耗散，但我们发现在双层内沿相反方向流动的反向流电流仍保持无耗散。$T_c$以上无耗散电流通道的存在归因于在反向流电流存在时，单个双层内局部超导相干对涡旋运动的抑制。我们的理论为双层铜氧化物中的赝能隙相提供了一个可能的情景。
英文摘要：
We report the existence of dissipationless currents in bilayer superconductors above the critical temperature $T_c$, assuming that the superconducting phase transition is dominated by phase fluctuations. Using a semiclassical $U(1)$ lattice gauge theory, we show that thermal fluctuations cause a transition from the superconducting state at low temperature to a resistive state above $T_c$, accompanied by the proliferation of unbound vortices. Remarkably, while the proliferation of vortex excitations causes dissipation of homogeneous in-plane currents, we find that counterflow currents, flowing in opposite direction within a bilayer, remain dissipationless. The presence of a dissipationless current channel above $T_c$ is attributed to the inhibition of vortex motion by local superconducting coherence within a single bilayer, in the presence of counterflow currents. Our theory presents a possible scenario for the pseudogap phase in bilayer cuprates.
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