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arXiv 2603.07342cond-mat.supr-con
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两能带超导体中自旋轨道和泽曼耦合下的能带配对

Interband pairing in two-band superconductors with spin-orbit and Zeeman couplings

Sapporo Shinyo High School(札幌新阳高等学校);Hirosaki University(弘前大学)

Shohei O. Shingu, Jun Goryo

AI总结:

研究通过泽曼磁场在两能带超导体中实现能带配对,发现无能隙的准粒子谱及异常热力学行为。

摘要:

在多能带超导体中,能带配对常常被忽视,因为其比能带内配对具有更高的能量成本。我们表明,在多能带系统中,一个泽曼磁场可以通过不同能带中自旋分裂分支的近简并性来稳定能带配对,即使在最小的局域吸引力相互作用下。使用具有局部破缺反演对称性的六方紧束缚模型,我们发现了一种由泽曼驱动的转变,即从传统的能带内s波态到以能带主导的超导混合态的转变。所得到的准粒子能谱本质上是无能隙的,导致异常的热力学行为,包括低温下的T线性比热容,反映了有限的零能态密度。

英文摘要:

Interband pairing in multiband superconductors is often neglected because of its higher energetic cost compared with intraband pairing. We show that, in multiband systems, a Zeeman magnetic field can stabilize interband pairing through the near degeneracy of spin-split branches from different bands, even within a minimal on-site attractive interaction. Using hexagonal tight-binding models with locally broken inversion symmetry, we find a Zeeman-driven transition between a conventional intraband s-wave state and an interband-dominated superconducting Mixing state. The resulting quasiparticle spectrum is intrinsically gapless, leading to anomalous thermodynamic behavior, including a T-linear specific heat at low temperatures, reflecting a finite zero-energy density of states.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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