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We propose a scheme to manipulate the electron-hole excitation in the voltagepulse electron source, which can be realized by a voltage-driven Ohmic contactconnecting to a quantum hall edge channel. It has been known that theelectron-hole excitation can be suppressed via Lorentzian pulses, leading tonoiseless electron current. We show that, instead of the Lorentzian pulses,driven via the voltage pulse $V(t) = 2 \frac{\hbar}{e}\sqrt{\frac{\sqrt{3}}{\pi} k_{\rm B} T_h} \arctanh( \frac{t - t_0}{t_0} )$ withduration $t_0$, the electron-hole excitation can be tuned so that thecorresponding energy distribution of the emitted electrons follows the Fermidistribution with temperature $T_{\rm D} = \sqrt{ T^2_{\rm S} + T^2_{\rm h} }$,with $T_{\rm S}$ being the electron temperature in the Ohmic contact. SuchFermi distribution can be established without introducing additional energyrelaxation mechanism and can be detected via shot noise thermometry technique,making it helpful in the study of thermal transport and decoherence inmesoscopic system.

On-demand electron source with tunable energy distribution