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000842699 1001_ $$0P:(DE-Juel1)171356$$aMessaoudi, Omar$$b0$$eCorresponding author$$ufzj
000842699 245__ $$aNondegenerate valleys in the half-metallic ferromagnet Fe / WS 2
000842699 260__ $$aWoodbury, NY$$bInst.$$c2018
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000842699 520__ $$aWe present a first-principles investigation of the electronic properties of monolayer WS2 coated with an overlayer of Fe. Our ab initio calculations reveal that the system is a half-metallic ferromagnet with a gap of ∼1 eV for the majority spin channel. Furthermore, the combined effect of time-reversal symmetry breaking due to the magnetic Fe overlayer and the large spin-orbit coupling induced by W gives rise to nondegenerate K and K′ valleys. This has a tremendous impact on the excited-state properties induced by externally applied circularly polarized light. Our analysis demonstrates that the latter induces a singular hot-spot structure of the transition probability around the K and K′ valleys for right and left circular polarization, respectively. We trace back the emergence of this remarkable effect to the strong momentum dependent spin-noncollinearity of the valence band involved. As a main consequence, a strong valley-selective magnetic circular dichroism is obtained, making this system a prime candidate for spintronics and photonics applications.
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000842699 536__ $$0G:(DE-Juel1)jias19_20161101$$aCalculation of quantum spin-fluctuations in nano-magnets (jias19_20161101)$$cjias19_20161101$$fCalculation of quantum spin-fluctuations in nano-magnets$$x1
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000842699 7001_ $$0P:(DE-Juel1)130805$$aLounis, Samir$$b3$$ufzj
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