Abstract
Shot-noise measurements are widely used for the characterization of nonequilibrium configurations in electronic conductors. The recently introduced quantum tomography approach was implemented for the studies of electronic wave functions of few-electron excitations created by periodic voltage pulses in phase-coherent ballistic conductors based on the high-quality GaAs two-dimensional electron gas. Still relying on the manifestation of Fermi correlations in noise, we focus on the simpler and more general approach beneficial for local measurements of energy distribution (ED) in electronic systems with arbitrary excitations with well-defined energies and random phases. Using biased diffusive metallic wire as a test bed, we demonstrate the power of this approach and extract the well-known double-step ED from the shot noise of a weakly coupled tunnel junction. Our experiment paves the way for local measurements of generic nonequilibrium configurations applicable to virtually any conductor.
| Original language | English |
|---|---|
| Article number | 085417 |
| Journal | Physical Review B |
| Volume | 102 |
| Issue number | 8 |
| DOIs | |
| Publication status | Published - Aug 2020 |
| MoE publication type | A1 Journal article-refereed |
Funding
Development of local noise measurements and measurements in devices D1 and D2 were performed under the support of Russian Science Foundation Grant No. 18-72-10135. Measurements in device D3 were performed under the support of the Russian Science Foundation Grant No. 19-12-00326. Fabrication of device D3 was performed using equipment of MIPT Shared Facilities Center and with financial support from the Ministry of Science and Higher Education. Analysis of ED evolution in magnetic field was performed within the state task of ISSP RAS. B.K. thanks European Union's Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie actions (Grant Agreement No. 766025).