Nuclear spin cooling by electric dipole spin resonance and coherent population trapping
| Autor: | Su-Qing Duan, Ai-Xian Li, Wei Zhang |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Physics
education.field_of_study Coherence time Condensed matter physics Spin polarization Population Spin engineering Electron Condensed Matter Physics 01 natural sciences Atomic and Molecular Physics and Optics 010305 fluids & plasmas Electronic Optical and Magnetic Materials 0103 physical sciences 010306 general physics Electric dipole spin resonance education Spin (physics) Coherence (physics) |
| Zdroj: | Physica E: Low-dimensional Systems and Nanostructures. 93:105-110 |
| ISSN: | 1386-9477 |
| DOI: | 10.1016/j.physe.2017.06.001 |
| Popis: | Nuclear spin fluctuation suppression is a key issue in preserving electron coherence for quantum information/computation. We propose an efficient way of nuclear spin cooling in semiconductor quantum dots (QDs) by the coherent population trapping (CPT) and the electric dipole spin resonance (EDSR) induced by optical fields and ac electric fields. The EDSR can enhance the spin flip-flop rate and may bring out bistability under certain conditions. By tuning the optical fields, we can avoid the EDSR induced bistability and obtain highly polarized nuclear spin state, which results in long electron coherence time. With the help of CPT and EDSR, an enhancement of 1500 times of the electron coherence time can been obtained after a 500 ns preparation time. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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