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Negative Excess Shot Noise by Anyon Braiding
Byeongmok Lee1, Cheolhee Han1, H-S Sim1
1Department of Physics, Korea Advanced Institute of Science and Technology, Daejeon 34141, Korea.
Physical Review Letters
|August 7, 2019
Summary
Researchers detected anyonic fractional charges using quantum point contact noise. They predict a novel negative excess noise signature of Abelian fractional statistics, distinct from conventional methods.
Area of Science:
- Condensed Matter Physics
- Quantum Information Science
Background:
- Anyonic fractional charges are exotic quasiparticles.
- Quantum Hall effects exhibit fractional charges and statistics.
- Detecting these properties is crucial for quantum technologies.
Purpose of the Study:
- To detect anyonic fractional charges using autocorrelation shot noise.
- To identify signatures of Abelian anyonic fractional statistics.
- To predict novel noise characteristics in fractional charge detection setups.
Main Methods:
- Utilizing autocorrelation shot noise at a quantum point contact (QPC).
- Analyzing electrical tunneling current noise.
- Introducing dilute injection of anyons from a biased edge.
Main Results:
- Autocorrelation noise reveals anyonic fractional charges (e*).
- A novel negative excess noise ( -2e*I) is predicted at large voltages.
- This negative noise is a signature of Abelian fractional statistics.
Conclusions:
- The study demonstrates a new method for detecting anyonic fractional charges.
- The predicted negative excess noise provides a distinct fingerprint for Abelian anyonic fractional statistics.
- This finding has implications for understanding topological phases and quantum computation.
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