Finite-frequency noise, Fano factor, ΔT-noise and cross-correlations in double quantum dots - Archive ouverte HAL
Article Dans Une Revue Journal of Physics: Condensed Matter Année : 2024

Finite-frequency noise, Fano factor, ΔT-noise and cross-correlations in double quantum dots

Résumé

Abstract A theoretical study on electrical current fluctuations in a double quantum dot connected to electronic reservoirs is presented, with the aim of deriving the finite-frequency noise, the Fano factor and the ΔT-noise. We establish a general expression for the noise in terms of Green functions in the double quantum dot and self-energies in the reservoirs. This result is then applied to model double quantum dots in various situations. For a non-interacting double quantum dot, we have highlighted several interesting features in the physical properties of this system. In particular, we have demonstrated the possibility of obtaining a significant reduction in zero-frequency noise and Fano factor either when the system is placed in a given operating regime, or when a temperature gradient is applied between the two reservoirs, resulting in a negative ΔT-noise being generated. In addition, in the vicinity of honeycomb vertices, a sign change is observed in the finite-frequency cross-correlator between the two reservoirs, in contrast to what is obtained for the zero-frequency cross-correlator, which remains negative throughout the (ε1,ε2)-plane, ε1, ε2 being the level energies in each of the two dots. By using an approximate first-level numerical approach, we finally study how the finite-frequency noise in a double quantum dot evolves under the influence of Coulomb interactions.
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Dates et versions

hal-04787790 , version 1 (18-11-2024)

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Crépieux Adeline, Quynh Duong, Mireille Lavagna. Finite-frequency noise, Fano factor, ΔT-noise and cross-correlations in double quantum dots. Journal of Physics: Condensed Matter, 2024, ⟨10.1088/1361-648X/ad92d4⟩. ⟨hal-04787790⟩
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