论文标题
超巨星旋转极化物在铁磁欧洲葡萄球菌中呈现光生
Hypergiant spin polarons photogenerated in ferromagnetic europium chalcogenides
论文作者
论文摘要
我们发现，在铁磁半导体EUS附近，单个带边缘光子产生了一个自旋极性（SP），其磁矩接近20,000 Bohr Magneton。这比先前报道的抗铁磁欧洲蛋白酶中的超级巨型光诱导的SPS大得多。铁磁EUS中较大的SP和EUO的预期仍然更大，它用光激发电子状态的较大的Bohr半径解释，它环绕并偏振了更多的晶格旋转。但是，由于光激发电子的波函数扩散在更大的体积上，因此光激发电子交换与单个格子旋转的相互作用会削弱，这使得SP更容易热淬火。
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.
