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Excited State Magnetic Exchange Interactions Enable Large Spin Polarization Effects
- Source :
- Journal of the American Chemical Society. 140(6)
- Publication Year :
- 2018
-
Abstract
- Excited state processes involving multiple electron spin centers are crucial elements for both spintronics and quantum information processing. Herein, we describe an addressable excited state mechanism for precise control of electron spin polarization. This mechanism derives from excited state magnetic exchange couplings that occur between the electron spins of a photogenerated electron-hole pair and that of an organic radical. The process is initiated by absorption of a photon followed by ultrafast relaxation within the excited state spin manifold. This leads to dramatic changes in spin polarization between excited states of the same multiplicity. Moreover, this photoinitiated spin polarization process can be "read" spectroscopically using a magnetooptical technique that is sensitive to the excited state electron spin polarizations and allows for the evaluation of wave functions that give rise to these polarizations. This system is unique in that it requires neither intersystem crossing nor magnetic resonance techniques to create dynamic spin-polarization effects in molecules.
- Subjects :
- Photon
Spin polarization
Spintronics
010405 organic chemistry
Chemistry
General Chemistry
Electron
010402 general chemistry
01 natural sciences
Biochemistry
Catalysis
0104 chemical sciences
Colloid and Surface Chemistry
Intersystem crossing
Excited state
Multiplicity (chemistry)
Atomic physics
Spin (physics)
Subjects
Details
- ISSN :
- 15205126
- Volume :
- 140
- Issue :
- 6
- Database :
- OpenAIRE
- Journal :
- Journal of the American Chemical Society
- Accession number :
- edsair.doi.dedup.....f7deb7570891b4040d4fe25e1e29035c