简介:
简介:扩大电子的一个模型是适合描述经由扫描掘显微镜获得的理论模拟和试验性的结果的更多,这被发现了,但是当动态性质容易被合并时,磁性,并且特别地电子旋转性质当测量不在时由于他们的构思的isotropy提出一个问题。一个电子的旋转与一个磁场反应并且因此有向量的性质。然而,电子纺纱也是各向同性的,建议它没有向量的性质。在对电子旋转的描述的这中央冲突,我们相信,矛盾的性质的许多的根为量旋转粒子被测量并且要求。利用电子旋转在真实三维的空间一致地在被描述的一个模型--一个扩大电子模型--我们证明纺纱可以被向量描述并且仍然维持它的isotropy。在这个框架,我们重新估计连续大小的Stern-Gerlach实验,Einstein-Podolsky-Rosen实验,和效果并且在所有情况中发现相当直觉的解释。
简介:Opticalspinsplittinghasattractedsignificantattentionowingtoitspotentialapplicationsinquantuminformationandprecisionmetrology.However,itistypicallysmallandcannotbecontrolledefficiently.Here,weenhancethespinsplittingbytransmittinghigher-orderLaguerre–Gaussian(LG)beamsthroughgraphenemetamaterialslabs.TheinteractionbetweenLGbeamsandmetamaterialresultsinanorbital-angularmomentum-(OAM)dependentspinsplitting.TheupperboundoftheOAM-dependentspinsplittingisfound,whichvarieswiththeincidentOAMandbeamwaist.Moreover,thespinsplittingcanbeflexiblytunedbymodulatingtheFermienergyofthegraphenesheets.Thistunablespinsplittinghaspotentialapplicationsinthedevelopmentofspin-basedapplicationsandthemanipulationofmid-infraredwaves.
简介:Weconsideraquantumparticleasawavepacketinthecoordinatespace.Whentheconjugatewavepacketinthemomentumspaceisconsidered,wefindthatthegroupvelocitiesofthesetwowavepackets,whichdescribetheparticledynamics,areinagreementwiththeHamiltonequationsonlyifinthetimedependentphasesoneconsiderstheLagrangianinsteadoftheHamiltonianwhichleadstotheconventionalSchr?dingerequation.Wedefinearelativisticquantumprincipleassertingthataquantumparticlehasafinitefrequencyspectrum,withacutoffpropagationvelocitycasauniversalconstantnotdependingonthecoordinatesystem,andthatanytimedependentphasevariationisthesameinanysystemofcoordinates.Fromthetimedependentphaseinvariance,therelativistickinematicsisobtained.Weconsidertwotypesofpossibleinteractions:1)Aninteractionwithanexternalfield,byamodificationofthetimedependentphasedifferentialwiththetermsproportionaltothedifferentialsofthespace-timecoordinatesmultipliedwiththecomponentsofthisfieldfour-potential,and2)aninteractionbyadeformationofthespace-timecoordinates,duetoagravitationalfield.Fromtheinvarianceofthetimedependentphasewithfieldcomponents,weobtainamechanicalforceoftheformofLorentz’sforce,andthreeMaxwellequations:TheGauss-Maxwellequationsfortheelectricandmagneticfluxes,andtheFaraday-Maxwellequationfortheelectromagneticinduction.Whenthefourthequation,Ampère-Maxwell,isconsidered,theinteractionfieldtakestheformoftheelectromagneticfield.Foralowpropagationvelocityoftheparticlewaves,wegetapacketofwaveswiththetimedependentphasesproportionaltotherelativisticHamiltonian,asinDirac’sfamoustheoryofspin,andaslowly-varyingamplitudewithaphaseproportionaltothemomentumandthisvelocity.Intheframeworkofourtheory,thespinisobtainedasanallquantumeffect,withoutanyadditionalassumptiontothequantumtheory.When
简介:ThespinHalleffectoflight(SHEL)canbeobservedbythedarkstripresultingfromweakmeasurement.WefindthattheSHELofapartiallycoherentbeam(PCB)hasasimilarphenomenonaswell.However,thedarkstripintheSHELofaPCBcannotbeexplainedbyconsideringthebeamasanassemblanceofcoherentspeckles.Also,thedarkstripinaPCBisnotpurelydark.Byanalyzingtheautocorrelation,weshowthattheSHELofaPCBistheresultofoverlappingcoherentspeckles'SHEL.Wefurtherproveourconclusionbyadjustingconvergenceandincidentangles.Finally,wedevelopaqualitativetheorytoclarifytheSHELofaPCB.
简介:第一原则的计算被执行探索一系列graphene-nanoribbon-basednanojunctions的解决纺纱的电子、热电的运输性质。由扭动,处于到反平行的、很大的通道磁致电阻的从平行的graphene领先的磁性的时刻能为所有结构在不同的门电压下面被获得。为短nanojunctions的解决纺纱的交替水流的传导力增加对频率但是为长nanojunctions减少。与增加连接长度,连接的行为从象电容一样改变到象引入一样。因为费密水平附近的旋转起来thermopower和旋转下面thermopower的相反的符号,纯旋转电流能被获得,优点的大数字能被为所有nanojunctions调整门电压和化学潜力完成。
简介:在当螺线部分导致铁电体极化时,沿着圆锥形的轴的旋转部件形成磁化的地方,圆锥形的旋转顺序与固有的磁电的联合拥有multiferroicity。蒙特卡罗模拟用古典海森堡尖晶石表现了(AB2O4)模型揭示一份多重圆锥形的旋转订单,即,有A上的不同的锥角度和波长的三调整地点和二个交替的B地点。旋转顺序不仅作为扎根的状态存在而且在一个更大的参数区域稳定地局部地幸存。整个存在范围能被anisotropy有效地扩展盖住CoCr2O4和MnCr2O4。多重圆锥形的旋转顺序被挫折和anisotropy很好在整个存在范围上维持并且细微地调节了,并且磁性并且铁电体性质相应地被影响。
简介:ThephotonicspinHalleffect(SHE)hasbeenintensivelystudiedandwidelyapplied,especiallyinspinphotonics.However,theSHEisweakandisdifficulttodetectdirectly.Inthispaper,weproposeamethodtoenhanceSHEwiththeguided-wavesurface-plasmonresonance(SPR).Bycoveringadielectricwithhighrefractiveindexonthesurfaceofsilverfilm,thephotonicSHEcanbegreatlyenhanced,andagianttransverseshiftofhorizontalpolarizationstateisobservedduetotheevanescentfieldenhancementneartheinterfaceatthetopdielectriclayerandair.Themaximumtransverseshiftofthehorizontalpolarizationstatewith11.5μmisobtainedwhenthethicknessofSifilmisoptimum.ThereisatleastanorderofmagnitudeenhancementincontrastwiththetransverseshiftintheconventionalSPRconfiguration.OurresearchisimportantforprovidinganeffectivewaytoimprovethephotonicSHEandmayoffertheopportunitytocharacterizetheparametersofthedielectriclayerwiththehelpofweakmeasurementsanddevelopmentofsensorsbasedonthephotonicSHE.
简介:因为它启用自由并且从而的光子旋转度的敏感控制,光的纺纱轨道相互作用(SOI)强烈地在nanophotonics被学习了光子的轨道,它为象信号编码和路由那样的应用程序是有用的。最近的研究[Phys。加快。Lett。117,166803(2016)]证明光子的SOI在光子通过宣传的媒介的介电常数面对一个坡度表明;这提高在沿着扭曲的轨道宣传的光子散布循环地极化的光和结果。这里,我们理论上预言那,因为在不同类的绝缘的媒介和在转变光学表明的一个重力的领域之间的等价,重要SOI被导致到一个黑洞的重力的透镜过去的循环地极化的光上。这导致:我)如果黑洞的尺寸比事件光子的波长小,沿着chiral轨道宣传的光子;ii)重力的透镜到的产生图象因为这些chiral轨道,表明方位角的旋转。为探查为并且用循环地极化的光发现subwavelength尺寸黑人洞的一个方法开的调查结果。
简介:Weperformmicromagneticsimulationsontheswitchingofmagneticvortexcorebyusingspin-polarizedcurrentsthroughathree-nanocontactgeometry.Oursimulationresultsshowthatthecurrentcombinationwithanappropriatecurrentflowdirectiondestroysthesymmetryofthetotaleffectiveenergyofthesystemsothatthevortexcorecanbeeasiertoexcite,resultinginlesscriticalcurrentdensityandafasterswitchingprocess.Besidesitsfundamentalsignificance,ourfindingsprovideanadditionalroutetoincorporatingmagneticvortexphenomenaintodatastoragedevices.