Journal article
Accuracy of circular polarization as a measure of spin polarization in quantum dot qubits
Physical review letters, Vol.91(25), pp.257901-2579014
12/19/2003
DOI: 10.1103/PhysRevLett.91.257901
PMID: 14754157
Abstract
A quantum dot spin light emitting diode provides a test of carrier spin injection into a qubit and a means for analyzing carrier spin injection and local spin polarization. Even with 100% spin-polarized carriers the emitted light may be only partially circularly polarized due to the geometry of the dot. We have calculated carrier polarization-dependent optical matrix elements for InAs/GaAs self-assembled quantum dots (SAQDs) for electron and hole spin injection into a range of quantum dot sizes and shapes, and for arbitrary emission directions. Calculations for typical SAQD geometries with emission along [110] show light that is only 5% circularly polarized for spin states that are 100% polarized along [110]. Measuring along the growth direction gives near unity conversion of spin to photon polarization and is the least sensitive to uncertainties in SAQD geometry.
Details
- Title: Subtitle
- Accuracy of circular polarization as a measure of spin polarization in quantum dot qubits
- Creators
- C E Pryor - University of IowaM E Flatté - University of Iowa
- Resource Type
- Journal article
- Publication Details
- Physical review letters, Vol.91(25), pp.257901-2579014
- DOI
- 10.1103/PhysRevLett.91.257901
- PMID
- 14754157
- NLM abbreviation
- Phys Rev Lett
- ISSN
- 0031-9007
- eISSN
- 1079-7114
- Language
- English
- Date published
- 12/19/2003
- Academic Unit
- Electrical and Computer Engineering; Physics and Astronomy
- Record Identifier
- 9984428673902771
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