The Junction That Remembers: Infrared Response of Two Coupled SYK Majorana Systems
Abstract
Two strongly interacting Majorana systems of the Sachdev--Ye--Kitaev type, each with its own independent disorder, are joined by a link that is switched on in time. We ask how the infrared structure of the link is imprinted on the response and whether the system remembers how it was opened. At large N the leading cross-correlation between the two systems is an exact product of two equilibrium propagators and the switching profile; because the disorder is independent, no ladder dresses it. The link operator has scaling dimension one half, which gives its susceptibility a universal logarithm whose coefficient and phase we fix and verify numerically, while the gap of the coupled equilibrium problem grows more slowly than the naive crossover estimate. Exact dynamics for up to twelve Majoranas per side show strong parity transfer and entanglement several times the free-fermion ceiling. The work done by the switch has a first-order part that does not depend on the switching time and a second-order part that grows in magnitude with it. Once the work is held fixed, the protocol dependence of the entanglement, the link expectation value and a scrambling diagnostic nearly vanishes, and the small residuals do not depend on whether the protocols differ at low or at high frequency. These small systems have no infrared window, so they neither confirm nor exclude memory at large N.
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BibTeX
@misc{vahedi2026junction,
title = {{The Junction That Remembers: Infrared Response of Two Coupled SYK Majorana Systems}},
author = {Ali Vahedi},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2609.05336},
eprint = {2609.05336},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.05336},
}
RIS
TY - UNPB
TI - The Junction That Remembers: Infrared Response of Two Coupled SYK Majorana Systems
AU - Ali Vahedi
PY - 2026
DA - 2026/10/07
PB - arXiv
DO - 10.48550/arxiv.2609.05336
UR - https://arxiv.org/abs/2609.05336
AB - Two strongly interacting Majorana systems of the Sachdev--Ye--Kitaev type, each with its own independent disorder, are joined by a link that is switched on in time. We ask how the infrared structure of the link is imprinted on the response and whether the system remembers how it was opened. At large N the leading cross-correlation between the two systems is an exact product of two equilibrium propagators and the switching profile; because the disorder is independent, no ladder dresses it. The link operator has scaling dimension one half, which gives its susceptibility a universal logarithm whose coefficient and phase we fix and verify numerically, while the gap of the coupled equilibrium problem grows more slowly than the naive crossover estimate. Exact dynamics for up to twelve Majoranas per side show strong parity transfer and entanglement several times the free-fermion ceiling. The work done by the switch has a first-order part that does not depend on the switching time and a second-order part that grows in magnitude with it. Once the work is held fixed, the protocol dependence of the entanglement, the link expectation value and a scrambling diagnostic nearly vanishes, and the small residuals do not depend on whether the protocols differ at low or at high frequency. These small systems have no infrared window, so they neither confirm nor exclude memory at large N.
ER -