Journal
PHYSICAL REVIEW LETTERS
Volume 103, Issue 21, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.103.217401
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Funding
- U. S. Department of Energy [DE-FG02-06ER46304]
- U.S. Department of Energy (DOE) [DE-FG02-06ER46304] Funding Source: U.S. Department of Energy (DOE)
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In an ultrafast laser-induced magnetization-dynamics scenario we demonstrate for the first time an exact microscopic spin-switch mechanism. Combining ab initio electronic many-body theory and quantum optics analysis we show in detail how the coherently induced material polarization for every elementary process leads to angular-momentum exchange between the light and the irradiated antiferromagnetic NiO. Thus we answer the long-standing question where the angular momentum goes. The calculation also predicts a dynamic Kerr effect, which provides a signature for monitoring spin dynamics, by simply measuring the transient rotation and ellipticity of the reflected light.
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