Enhanced Spin Polarization from Biaxially Strained Colloidal Quantum Dots

Electron and hole spin polarization is crucial for quantum dots to be used in spin lasers and quantum information processing. However, the degree of spin polarization in II–VI and III–V semiconductor quantum dots is low because of the degenerated valence band. Here, we increase the light and heavy hole degeneracy by introducing biaxial strain into CdSe-based quantum dots, enabling the degree of spin polarization to be increased from 20% to 50% under photoexcitation. The optical gain threshold measurement further reveals that the increase in polarization helps to reduce the gain threshold

Leaf widths in parental lines, RIL, and IF₂ populations across three environments.

<p>Leaf widths in parental lines, RIL, and IF₂ populations across three environments.</p

Phenotypic correlations among traits in the RIL population (below diagonal) and the IF₂ population (above diagonal).

<p>Phenotypic correlations among traits in the RIL population (below diagonal) and the IF₂ population (above diagonal).</p

QTL detected in the IF₂ population.

<p>QTL detected in the IF₂ population.</p

Meta-QTL (mQTL) for the seven consecutive leaf-widths below the tassel in the RIL and IF₂ populations.

<p>Meta-QTL (mQTL) for the seven consecutive leaf-widths below the tassel in the RIL and IF₂ populations.</p

QTL detected in the RIL population.

<p>QTL detected in the RIL population.</p

Phenotypic effects of introgression segments in chromosome 4 and 6 detected in three environments.

<p>A and B represent marker genotypes that are the same as SL57 and Ye478, respectively.</p><p>2010BD, 2010SY and 2011BD indicate that kernel number per row was measured in 2010 at Baoding (Northern China), in 2010 at Sanya (Southern China) and in 2011 at Baoding, respectively.</p

Genotype and phenotype of homozygous recombinant lines developed from a large F₂ population in summer 2011.

<p>3a shows the genotype of the recombinant lines, No. shows the number of samples, A and B represent marker genotypes that are the same as SL57-6 and Ye478, respectively. 3b–3e show phenotypes of kernel number per row (3b), ear length (3c), ear weight (3d) and grain weight per ear (3e) detected in winter 2011 at Sanya, respectively. **: Significant difference at P = 0.01.</p

Genotype and phenotype of homozygous recombinants selected from the F₂ in 2011.

<p>A and B represent marker genotypes that are the same as SL57-6 and Ye478, respectively.</p><p>No. shows the number of recombinants with the same genotype.</p

Relative level of candidate gene expression in immature ears.

<p>S2: Differentiation stage of the spikelet-pair meristem. S3: Differentiation stage of the spikelet meristem. **: Significant difference at P = 0.01, ***: Significant difference at P = 0.001.</p