发表机构
Institute of Particle Physics and Key Laboratory of Quark and Lepton Physics (MOS), Central China Normal University（粒子物理研究所和夸克与轻子物理重点实验室（教育部），华中师范大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
该研究在具有轴子动量弛豫的双电流Gubser-Rocha模型中，分析不同非最小费米子耦合通道对费米子谱函数的影响，阐明了电流混合等因素对全息费米子激发的重塑作用。
AI 中文摘要
我们研究具有线性轴子动量弛豫的双电流Gubser-Rocha背景下的费米子谱函数。作为对比通道，偶极耦合p₁会产生软的非对称重构，且不会形成清晰的硬莫特能隙。我们的主要分析聚焦于受电流混合调制的两个轴子依赖的非最小耦合：p₂张量通道会抑制零能费米峰，并将主导谱权重转移到有限频率，形成平底重构；与之相反，p₃矢量通道会在动量空间产生强谱不对称性，生成开放的类费米弧段。改变动量弛豫强度β/μ和掺杂参数χ，可揭示双电流背景下通道依赖的响应：增大β/μ通常会拓宽p₂的响应，而单侧p₃特征随背景参数变化呈非单调变化。这些结果阐明了电流混合、轴子诱导的动量弛豫与非最小费米子耦合如何共同重塑全息费米子激发。
英文摘要
We investigate fermionic spectral functions in a two-current Gubser-Rocha background with linear-axion momentum relaxation. Serving as a comparison channel, the dipole coupling $p_1$ is found to produce a soft asymmetric reconstruction without opening a clean hard Mott gap. Our main analysis then focuses on two axion-dependent non-minimal couplings modulated by current mixing. The $p_2$ tensor channel suppresses the zero-energy Fermi peak and shifts the dominant spectral weight to finite frequencies, resulting in a flat-bottom reconstruction. In contrast, the $p_3$ vector channel creates a strong spectral asymmetry in momentum space, generating open, Fermi-arc-like segments. Varying the momentum-relaxation strength $β/μ$ and the doping parameter $χ$ reveals a channel-dependent response to the two-current background. Increasing $β/μ$ generally broadens the $p_2$ response, whereas the one-sided $p_3$ feature varies non-monotonically under changes of the background parameters. These results clarify how current mixing, axion-induced momentum relaxation, and non-minimal fermion couplings jointly reshape holographic fermionic excitations. These results clarify how current mixing, axion-induced momentum relaxation, and non-minimal fermion couplings jointly reshape holographic fermionic excitations.
Comments27 pages, 8 figures
