Mixed, charge and heat noises in thermoelectric nanosystems

摘要: Mixed, charge and heat current fluctuations as well thermoelectric differential conductances are considered for non-interacting nanosystems connected to reservoirs. Using the Landauer-Buttiker formalism, we derive general expressions these quantities consider their possible relationships in entire ranges of temperature, voltage coupling environment or We introduce a dimensionless quantity given by ratio between product mixed noises noises, distinguishing auto-ratio defined same reservoir cross-ratio distinct From linear response regime high-voltage regime, further specify analytical conductances, ratios examine behavior two concrete nanosystems: quantum point contact an ohmic single energy level dot In find that equal each other simply related figure merit. They can be expressed terms with help fluctuation-dissipation theorem. non-linear radically distinguish themselves remains bounded one, while exhibits rich complex behaviors. nanosystem, moreover demonstrate efficiency Schottky regime. intermediate changes sign diverges, which evidences change cross-noise.