Origin of spin reorientation and intrinsic anomalous Hall effect in the kagome ferrimagnet TbMn 6 Sn 6
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Using rst-principlescalculationswithindensityfunctionaltheory,weinvestigatetheintrinsicspinHalleffectinmonolayersofgroup-VItransition-metaldichalcogenidesMX2(M=Mo,WandX=S,Se).MX2monolayersaredirectband-gapsemiconductorswithtwodegeneratevalleyslocatedatthecornersofthehexagonalBrillouinzone.Becauseoftheinversionsymmetrybreakingandthestrongspin-orbitcoupling,chargecarriersinoppositevalleyscarryoppositeBerrycurvatureandspinmoment,givingrisetobothavalley-Hallandaspin-Halleffect.WealsoshowthattheintrinsicspinHallconductivityininversion-symmetricbulkdichalcogenidesisanorderofmagnitudesmallercomparedtomonolayers.Ourresultdemonstratesmonolayerdichalcogenidesasanidealplatformfortheintegrationofvalleytronicsandspintronics.
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