Light emission in delta-T-driven mesoscopic conductors

Abstract

The scattering picture of electron transport in mesoscopic conductors shows that fluctuations of the current reveal additional information on the scattering mechanism not available through the conductance alone. The electronic fluctuations are coupled to the electromagnetic field and a junction at finite bias or temperature will emit radiation. The nonsymmetrized current-current correlators characterize the emission and absorption spectrum. Recent interest is focused on the so-called delta-T noise, which is the nonequilibrium noise caused by a temperature difference between the terminals. Here, we generalize the notion of delta-T noise to the nonsymmetrized current-current correlator at finite frequencies. We investigate the spectral density for energy-independent scattering and for a resonant level as an example of energy-dependent scattering. We find that a temperature difference $\Delta T$ leads to a partial reduction of the noise for certain frequency ranges. This is a consequence of temperature broadening in combination with a frequency shift of the involved Fermi distributions. In the case of energy-independent scattering, the lowest order is a quadratic $\propto (\Delta T{)}^2$ correction of the thermal-like noise spectrum. For the resonance, additional contributions to the delta-T noise spectrum arise that are $\propto \Delta T$ to the lowest order.

8 pages, final published version

References in corpus (10)

• Elementary events of electron transfer in a voltage-driven quantum point contact
• Electronic heat flow and thermal shot noise in quantum circuits
• Absent thermal equilibration on fractional quantum Hall edges over macroscopic scale
• General bounds on electronic shot noise in the absence of currents
• Charge, spin, and heat shot noises in the absence of average currents: Conditions on bounds at zero and finite frequencies
• Does delta-$T$ noise probe quantum statistics?
• Finite frequency noise of a superconductor/ferromagnet quantum point contact
• Delta-T noise in the Kondo regime
• Delta-T noise for fractional quantum Hall states at different filling factor
• Conductance of correlated many-fermion systems from charge fluctuations

Cited by in corpus (6)

• Role of scaling dimensions in generalized noises in fractional quantum Hall tunneling due to a temperature bias
• $\Delta T$-noise in Multiterminal Hybrid Systems
• Machine learning delta-T noise for temperature bias estimation
• Effect of uniaxial magnetic anisotropy on charge transport in a junction with a precessing anisotropic molecular spin
• Finite-frequency noise, Fano factor, $\Delta T$-noise and cross-correlations in double quantum dots
• Colored ${\Delta }_T$ noise probes the topological character of edge modes