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Manipulation of Pauli spin blockade in double quantum dot systems
WenJie Hou1, YuanDong Wang1, JianHua Wei1
1Department of Physics, Renmin University of China, Beijing 100872, China.
The Journal of Chemical Physics
|November 23, 2017
Summary
Pauli spin blockade (PSB) in double quantum dots (DQDs) is explored using a novel nonperturbative method. This study reveals new insights into PSB manipulation and characteristics, including finite leakage current and ON-OFF switching.
Area of Science:
- Quantum physics
- Condensed matter physics
- Nanotechnology
Background:
- Pauli spin blockade (PSB) is a key phenomenon in double quantum dot (DQD) systems.
- Understanding PSB is crucial for developing quantum information technologies.
Purpose of the Study:
- To systematically study the Pauli spin blockade (PSB) effect in double quantum dots (DQDs).
- To elucidate the physical picture of PSB using a nonperturbative method.
- To explore various manipulation techniques for PSB.
Main Methods:
- Utilized a recently developed nonperturbative method: the hierarchical equations of motion approach.
- Analyzed current-voltage characteristics.
- Examined nonequilibrium spectral function features.
Main Results:
- Explicitly elucidated the physical picture of PSB.
- Demonstrated finite leakage current in the strongly correlated limit.
- Showcased enhancement and lifting of PSB by exchange interaction.
- Achieved ON-and-OFF switching of PSB via real-time modulation.
Conclusions:
- The hierarchical equations of motion approach provides a robust framework for studying PSB.
- PSB exhibits complex behaviors beyond low-order perturbation theory.
- Gate voltage, exchange interaction, and electron spin resonance offer effective control over PSB.
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