Work

Transport properties and thermopower of the spinful Sachdev-Ye-Kitaev dot

Year: 2026

Type: article

Abstract: We study the electric and thermoelectric transport through a spinful complex Sachdev-Ye-Kitaev (SYK) quantum dot coupled to metallic leads, forming a N-SYK-N junction, by the Keldysh field theory approach. Unlike traditional equilibrium approaches, our formulation treats the system as an open, interacting quantum conductor under non-equilibrium conditions, without resorting to the replica trick. Starting from the exact Keldysh-Dyson equations, we derive analytical results for the tunneling and zero-temperature limits and perform a numerical analysis in the linear-response regime. We characterize the dependence of conductance, thermoelectric coefficient, and Seebeck effect on the particle-hole asymmetry parameter and coupling strength to the leads. Our results reveal distinctive non-Fermi liquid signatures of the SYK model in transport properties and identify coupling regimes where thermoelectric effects are enhanced, suggesting experimentally accessible fingerprints of SYK physics in mesoscopic systems.

Source: SciPost Physics Core

DOI: 10.21468/scipostphyscore.9.3.061

Authors: Daniele Morotti, Marco Uguccioni, Luca Dell'Anna

Institutions: University of Padua, Istituto Nazionale di Fisica Nucleare, Galileo Galilei Institute for Theoretical Physics

Language: English

Topic: Quantum and electron transport phenomena

Subfield: Atomic and Molecular Physics, and Optics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: diamond

Funders: Dipartimenti di Eccellenza, European Commission, Ministero dell'Università e della Ricerca, NextGenerationEU

Awards: G2372493982, G4080017644, G5356239126