Regensburg 2022 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 29: Transport: Poster Session
TT 29.13: Poster
Thursday, September 8, 2022, 15:00–18:00, P1
Light emission in Δ T-driven mesoscopic conductors — •Matthias Hübler and Wolfgang Belzig — University Konstanz
The scattering approach paves the way for the description of electron transport and current fluctuations in mesoscopic conductors. If fluctuations are coupled to an electromagnetic field, then they are related to the rate at which the field transfers energy to or receives energy from the conductor. The non-symmetrized current-current correlator characterizes the emission and absorption spectrum. Recent interest is concerned with Δ T noise, which is the non-equilibrium noise caused by a temperature difference between the terminals. Here we generalize the notion of Δ T noise to the non-symmetrized current-current correlator at finite frequencies. The spectrum is investigated for energy-independent scattering and for a resonant level as an example of energy-dependent scattering. We find that a temperature difference Δ T leads to a partially negative Δ T noise spectrum. 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 ∝ (Δ T)2 correction of the thermal-like noise spectrum. For the resonance, there arises an additional contribution to the Δ T noise spectrum that is ∝ Δ T at the lowest order.