Efficient dynamical nuclear polarization in quantum dots: Temperature dependence

Details Efficient dynamical nuclear polarization in quantum dots: Temperature dependence Efficient dynamical nuclear polarization in quantum dots: Temperature dependence

2007-07-03

arxiv.org/abs/0707.0370v1

Physical Review B 76, 201301 (R) (2007)

Physics

Condensed Matter

Other Condensed Matter

5 pages, 3 figures

Scientific paper

10.1103/PhysRevB.76.201301

We investigate in micro-photoluminescence experiments the dynamical nuclear polarization in individual InGaAs quantum dots. Experiments carried out in an applied magnetic field of 2T show that the nuclear polarization achieved through the optical pumping of electron spins is increasing with the sample temperature between 2K and 55K, reaching a maximum of about 50%. Analysing the dependence of the Overhauser shift on the spin polarization of the optically injected electron as a function of temperature enables us to identify the main reasons for this increase.

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