Related Experiment Videos
Shot-noise in transport and beam experiments.
1Department of Condensed Matter Physics, Weizmann Institute of Science, Rehovot, 76100, Israel.
Physical Review Letters
|December 12, 2001
Summary
Two Fermi gases with identical average currents exhibit different temporal fluctuations. A beam of electrons is noisier than a transport gas due to single-particle transitions into empty states.
Area of Science:
- Condensed matter physics
- Quantum transport
Background:
- Understanding current fluctuations is crucial for quantum devices.
- Fermi gases are fundamental models in condensed matter physics.
Purpose of the Study:
- To compare current noise in two types of Fermi gases with identical average currents.
- To investigate the origins of temporal current fluctuations.
Main Methods:
- Modeling two Fermi gas systems: a transport gas and a beam.
- Expressing current noise as a sum over single-particle transitions.
Main Results:
- The beam Fermi gas exhibits significantly higher current noise than the transport gas.
- This increased noise in the beam is attributed to single-particle transitions into unoccupied states below the chemical potential.
- Correlations between terminals 2 and 3 remain identical for both systems.
Conclusions:
- The configuration of electron injection significantly impacts current noise in Fermi gases.
- Single-particle transitions play a key role in determining temporal current fluctuations.
- Despite noise differences, inter-terminal correlations can be invariant.