Heat-mode excitation in a proximity superconductor

Understand

Mesoscopic superconductivity deals with various quasiparticle excitation modes, only one of them -- the charge-mode -- being directly accessible for conductance measurements due to the imbalance in populations of quasi-electron and quasihole excitation branches.

• Other modes carrying heat or even spin, valley etc.
• currents populate the branches equally and are charge-neutral, which makes them much harder to control.
• This noticeable gap in the experimental studies of mesoscopic non-equilibrium superconductivity can be filled by going beyond the conventional DC transport measurements and exploiting spontaneous current fluctuations.