期刊
PHYSICAL REVIEW LETTERS
卷 93, 期 5, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.93.057401
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资金
- Engineering and Physical Sciences Research Council [GR/S76076/01, GR/A10267/01, GR/R65534/01] Funding Source: researchfish
The temperature dependence of spin coherence in InGaAs quantum dots is obtained from quantum beats observed in polarization-resolved pump-probe experiments. Within the same sample we clearly distinguish between coherent spin dynamics leading to quantum beats and incoherent long-lived spin-memory effects. Analysis of the coherent data using a theoretical model reveals approximate to10 times greater stability of the spin coherence at high temperature compared to that found previously for exciton states in four-wave-mixing experiments by Borri et al. [Phys. Rev. Lett. 87, 157401 (2001)]. The data on incoherent polarization reveal a new form of spin memory based on charged quantum dots.
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