Tyler Park Jeffrey Farrer John Colton Haeyeon Yang APS March Meeting 2012, Boston.

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Presentation transcript:

Tyler Park Jeffrey Farrer John Colton Haeyeon Yang APS March Meeting 2012, Boston

Dong Jun Kim and Haeyon Yang, Nanotechnology,(2008). Zh. M. Wang, et al., Journal of Applied Physics, (2006).  What are quantum dot “chains?”  What is their significance?  Optoelectronic Devices  Conduit for spin information W. V. Schoenfeld et al., Appl. Phys. Lett. (1999)

 Prepatterned Substrates Lee et al., Nanotechnology, (2006)  Stranski-Krastanov (1939) InGaAs  Strain driven self-assembly M. Riotte et al., Applied Physics Letters, (2004)

 Grown at lower temperature so quantum dots don’t form yet  Annealing process, during which dots are formed  More control on growth A.O. Kosogov et al., Appl. Phys. Lett. (1996)  3 samples with slightly different growth parameters InGaAs

 Photoluminescence (PL) spectroscopy  Time-resolved PL  Transmission electron microscopy (TEM)  Chains with GaAs cap*  Chemical analysis Partial electron energy-loss spectroscopy (PEELS) X-ray energy dispersive spectroscopy (XEDS) *Zh. M. Wang et al., Journ. Of App. Phys. (2006)

 Focused Ion Beam (FIB)  Cross-section cuts  Lift-out method  Plan view cuts  Our own method?

 Contamination  Damage from silicon sample holder  Cross-section cuts  Difficult to see an individual dot  Plan view cuts  Quantum dots are close to surface  Thinning issues  Platinum deposits

 Images  Chemical Analysis:  B (EDS)

 The quantum dots seen, but not individually  Chemical analysis is so far close to what we were expecting  Continue with chemical analysis on cross- section cuts  Find a practical way of obtaining a plan view cut  Future work: Spin information transmission?