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Quantum Phase Coherence in Mesoscopic Transport Devices with Two-Particle Interaction
Zhimei Wang1, Xiaofang Guo1, Haibin Xue2
1Institute of Theoretical Physics, Shanxi University, Shanxi, Taiyuan 030006, China.
Scientific Reports
|August 11, 2015
Summary
We show a new quantum phase coherence (QPC) arising from two-body interactions in quantum dots. This discovery, based on quantum master equation analysis, reveals flux-dependent oscillations with potential applications in probing interactions.
Area of Science:
- Quantum physics
- Condensed matter physics
- Quantum information science
Background:
- Quantum phase coherence (QPC) is crucial for quantum phenomena.
- Understanding multi-particle interactions in quantum systems is challenging.
- Electron transport through quantum dots is a key area of research.
Purpose of the Study:
- To demonstrate a novel type of quantum phase coherence (QPC) generated by two-body interactions.
- To analyze the full counting statistics of electron transport in a specific quantum dot setup.
- To explore the potential applications of the observed phenomena.
Main Methods:
- Quantum master equation analysis
- Full counting statistics of electron transport
- Utilizing two parallel quantum dots with antiparallel magnetic fluxes
- Eliminating Aharonov-Bohm interference
Main Results:
- Demonstrated a new type of two-body interacting quantum phase coherence (QPC).
- Observed flux-dependent oscillations in zero-frequency cumulants (shot noise, skewness).
- Identified characteristic periods in the oscillations.
Conclusions:
- The observed QPC is a direct result of two-body Coulomb interaction.
- Quantized peaks in the cumulant spectrum offer a method to probe two-body Coulomb interactions.
- This work provides new insights into interacting quantum systems and potential metrology applications.
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