论文标题
温度调谐的费米表面拓扑和非中心对称超导体的分割
Temperature tuned Fermi surface topology and segmentation in non-centrosymmetric superconductors
论文作者
论文摘要
我们报告了在存在面板内的Zeeman场的情况下，在非中心对称超导体中调节热波动的第一个全面的微观描述。使用非扰动方法，我们证明了短范围波动的超导对相关性会导致费米表面的分割，并以方向依赖的对破裂和用于准粒子散射的热点。此外，实现了费米表面拓扑的波动驱动的变化，其特征是相应的狄拉克点从微不足道的$ {\ bf k} = 0 $转移到非琐事$ {\ bf k} \ neq 0 $。我们的结果为这些系统性能的热量表和热稳定性方案提供了关键的基准测试，从应用的角度到Spintronic设备非常重要。我们的理论估计值与最近的差异电导和二粒二粒干扰测量值符合非定性协议。提出了用于准颗粒的有限动量散射和相关光谱特征的通用理论框架，这有望适用于广泛的超导材料。
We report the first comprehensive microscopic description of the thermal fluctuations tuned Fermi surface characteristics in a non-centrosymmetric superconductor, in presence of an in-plane Zeeman field. Using a non perturbative approach we demonstrate that short range fluctuating superconducting pair correlations give rise to segmentation of the Fermi surface with direction dependent pair breaking and hotspots for quasiparticle scattering. Further, a fluctuation driven change in the Fermi surface topology is realized, characterized by a shift of the corresponding Dirac point from the trivial ${\bf k}=0$ to the non trivial ${\bf k} \neq 0$. Our results provide key benchmarks for the thermal scales and regimes of thermal stability of the properties of these systems, that are important from the applied perspective to spintronic devices. Our theoretical estimates are in remarkable qualitative agreement with the recent differential conductance and quasiparticle interference measurements on Bi$_{2}$Te$_{3}$/NbSe$_{2}$ hybrid. A generic theoretical framework for the finite momentum scattering of quasiparticles and the associated spectroscopic features is proposed, which is expected to be applicable to a wide class of superconducting materials.
