电荷密度波交织超导体中的超流效应
Supercurrent effect in a charge density wave intertwined superconductor
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中文总结 AI 辅助
研究电荷密度波交织超导体中超流效应，利用扫描隧道光谱成像揭示超导NbSe2中CDW调制的场驱动对称性破缺，通过模型计算表明各向异性源于E-k色散重建，可按需调整CDW调制及可视化分布，突出动量空间工程控相新机制。
中文摘要 AI 辅助
准粒子的能量-动量（E-k）色散是凝聚态物质系统中的一个基本概念。通过超电流诱导的超导体中博戈留波夫准粒子光谱的多普勒频移来修改E-k色散的能力，能够操纵各种涌现的量子特性。然而，对与电荷序交织的超导体上超流效应的研究仍然很少。在这里，我们报告了由施加的面内磁场的抗磁响应产生的迈斯纳电流，可以在前驱电荷密度波（CDW）矢量处调整博戈留波夫准粒子激发。我们的扫描隧道光谱成像揭示了超导NbSe2中CDW调制的场驱动对称性破缺，特别是从C3v到Cs的转变。模型计算表明，观察到的各向异性源于选择性多普勒频移诱导的E-k色散重建。此外，改变场方向能够按需调整各向异性CDW调制并可视化其动量空间分布。这些结果突出了一种通过动量空间工程控制涌现电子相的新机制。
英文摘要
The energy-momentum (E-k) dispersion of quasiparticles constitutes a fundamental concept in condensed matter systems. The ability to modify the E-k dispersion, exemplified by supercurrent-induced Doppler shifts of Bogoliubov quasiparticle spectra in superconductors, enables manipulation of various emergent quantum properties. However, investigations into the supercurrent effect on superconductors intertwined with charge orders remain scarce. Here, we report that the Meissner current, generated by the diamagnetic response to an applied in-plane magnetic field, can tailor Bogoliubov quasiparticle excitations at the precursor charge density wave (CDW) vectors. Our scanning tunneling spectroscopic imaging reveals a field-driven symmetry breaking of CDW modulations, specifically a C3v-to-Cs transition, in superconducting NbSe2. Model calculations suggest that the observed anisotropy originates from a selective Doppler-shift-induced E-k dispersion reconstruction. Furthermore, altering the field direction enables on-demand tuning of anisotropic CDW modulations and visualization of their momentum-space distribution. These results highlight a novel mechanism for controlling emergent electronic phases through momentum-space engineering.
