铁磁铕硫族化物中光生超巨自旋极化子
Hypergiant spin polarons photogenerated in ferromagnetic europium chalcogenides
摘要：
我们发现，在铁磁半导体EuS中，在居里温度附近，单个带边光子产生自旋极化子（SP），其磁矩接近20，000玻尔磁子。这比以前报道的反铁磁铕硫属化物中的超巨星光致SPs要大得多。较大的SP在铁磁EuS，和更大的预期EuO，是由一个更大的光激发电子态的玻尔半径，包围和极化的晶格自旋的更大的解释。然而，由于光激发电子的波函数在更大的体积上扩展，光激发电子与各个晶格自旋的交换相互作用减弱，这使得SP更容易热猝灭。
英文摘要：
We find that in the ferromagnetic semiconductor EuS, near its Curie temperature, a single band-edge photon generates a spin polaron (SP), whose magnetic moment approaches 20,000 Bohr magnetons. This is much larger than the supergiant photoinduced SPs in antiferromagnetic europium chalcogenides, reported previously. The larger SP in ferromagnetic EuS, and still larger expected for EuO, is explained by a larger Bohr radius of the photoexcited electron state, which encircles and polarizes a greater number of lattice spins. However, because the wave function of the photoexcited electron spreads over a greater volume, the photoexcited electron exchange interaction with individual lattice spins weakens, which makes the SP more easily quenched thermally.
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