Fermionic Spectral Functions in a Two-Current Gubser-Rocha Model with Axion Momentum Relaxation
Abstract
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 p1 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 p2 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 p3 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 p2 response, whereas the one-sided p3 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.
Related
- Deep learning emergent spacetime from fermionic spectral functions in holography
- The Critical Role of Itinerant Contributions to Orbital Angular Momentum Relaxation and Dynamics
- Spin-Hall devices: spin relaxation spatially separates current injection from Joule dissipation
- Spin relaxation of heavy quarks from momentum diffusion in the quark-gluon plasma
- Which scale breaks quarkonium? A controlled comparison of density and momentum relaxation in holographic QCD
BibTeX
@misc{liu2026fermionic,
title = {{Fermionic Spectral Functions in a Two-Current Gubser-Rocha Model with Axion Momentum Relaxation}},
author = {Cai-E Liu and Defu Hou},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.11323},
eprint = {2610.11323},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.11323},
}
RIS
TY - UNPB
TI - Fermionic Spectral Functions in a Two-Current Gubser-Rocha Model with Axion Momentum Relaxation
AU - Cai-E Liu
AU - Defu Hou
PY - 2026
DA - 2026/10/08
PB - arXiv
DO - 10.48550/arxiv.2610.11323
UR - https://arxiv.org/abs/2610.11323
AB - 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.
ER -