简介:在前後一致的Hartree-Fock近似以内,一在为不同类的Bose气体的扎根的州的精力的这近似表情明确是被导出一Bose爱因斯坦冷凝物的不同类的密度功能。获得的结果与Bose爱因斯坦冷凝物为系统在单个粒子的密度矩阵基于离开斜的远程的顺序的存在。这使避免异常一般水准的使用可能。动能的明确的形式,在Gross-Pitaevski途径不同于一个,被发现。动能的获得的形式在Hartree-Fock近似以外是有效的并且能被申请任意的强壮的interparticle相互作用。
简介:在量interferometry,为高精确的大小的成就控制并且利用非线性的相互作用是重要的。由于他们的长连贯时间和高可控制性,包括Bose的ultracold原子压缩了原子广泛地为量interferometry被使用了。这里,我们与Bose在量interferometry的理论研究考察最近的进步压缩原子。特别地,我们集中于原子原子相互作用导致的非线性的现象,并且怎么控制并且利用这些非线性的现象。与吝啬地的描述,由于原子原子相互作用,事波浪solitons出现在干扰模式,和宏观的量自我套住在Bose-Josephson连接存在。与许多身体描述,原子原子相互作用能产生非古典的纠纷,它能被利用在标准量限制以外完成高精确的大小。
简介:WaveRadio曾经是BOSE最畅销的产品之一,而WaveRadio/CD是Waveradio的改进版本,也是BOSE的最成功的桌面闹钟和音响。
简介:Inthisarticle,theauthorsconsiderthecollapsesolutionsofCauchyproblemforthenonlinearSchrdingerequationiψt+1/2△ψ-1/2ω2|x|2ψ+|ψ|2ψ=0,x∈R2,whichmodelstheBose-Einsteincondensatewithattractiveinteractions.Theauthorsestablishthelowerboundofcollapserateast→T.Furthermore,theL2-concentrationpropertyoftheradiallysymmetriccollapsesolutionsisobtained.
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简介:一个维的Bose气体是不平常的超流体。与更高空间的尺寸相对照,非古典的旋转惯性的存在直接没被连接到无穷小的杂质的无驱散的运动。最近,有原子开始了的ultracold的试验性的测试和为drag力量的量的预言由动人的障碍经历了变得可得到。这热门评论讨论在与superfluidity的四轮马车标准的关系从线性反应理论获得的drag力量。基于在之上改进了动态结构因素的分析、数字的理解,不同障碍潜力的结果被获得包括单个杂质,光格子和随机的潜力从点缀模式产生了。在随机的潜力的superfluidity的动态故障在这些系统在与安德森本地化和预言的超流体绝缘体转变的关系被讨论。
简介:QuantumdispersionsofvarioussetsofdynamicalvariablesofanopenBose-Hubbardsysteminaclassicallimitarestudied.Tothisend,anopensystemisdescribedintermsofstochasticevolutionofitsquantumpurestates.Itisshownthattheclassofvariablesthatdisplayclassicalbehaviourcruciallydependsonthetypeofnoise.Thisisrelevantinthemean-fieldapproximationofopenBose-Hubbarddynamics.
简介:TheentanglemententropyofanacousticblackholeinaBose–Einsteincondensates(BEC)isderived,whichisassociatedwiththephononsgeneratedviatheHawkingmechanisminasonichole.ConsideringthedispersionrelationofaBEC,werecalculatetheentanglemententropyoftheacousticblackholebymeansofstatisticalmethodintwolimits.Wefindthattheentropyisstillproportionaltotheareaofeventhorizon,butwithacoefcientdependentontheinfraredcutof.
简介:WeobtainsolitonandplanewavesolutionsforthecouplednonlinearSchr?dingerequations,whichdescribethedynamicsofthethree-componentBose-EinsteincondensatesbyusingtheHirotamethod.Meanwhilewefindthatthesystemwhichhasattractiveatomicinteractionwillonlypossessashapechanging(inelastic)collisionpropertyduetointensityredistributionintheabsenceofthespin-exchangeinteraction.Asadiscussedexample,weinvestigatetheone-soliton,two-solitonsolutionsandcollisionaleffectsbetweenbrighttwo-soliotnsolution,whichleadtotheintensityredistribution.
简介:Inthereportwepointoutthatthereexistsanintrinsicdifferenceintheinternalsymmetryofthetwocomponentsspin-1/2BosecondensatesfromthatofspinorBosecondensatesoftheatomswithhyperfinestatesofnonzerointeger-spins,whichgivesrisetoanewtopologicalconstrainonthecirculationforthistwo-componentspin-1/2Bosecondensates.ItisshownthattheSU(2)symmetryofthespin-1/2Bosecondensateimpliesa
简介:Inthispaper,weinvestigateexcitedcharacteristicoftheweaklyinteractingquasi-one-dimensional(1D)andquasi-two-dimensional(2D)Bose–Einsteincondensation(BEC)inharmonicpotentialtrap.Theenergyspectrumandtheanalyticalexpressionofthesoundvelocityareobtainedandanalyzed.Comparedwith3-DimensionalhomogeneousBose-condensedgasoccasion,thesoundvelocityof2DBose-Einsteincondensationinharmonicpotentialtrapissmaller.
简介:顶级音响品牌Bose推出新一代贴耳式耳机:OE2贴耳式耳机以及OE2i贴耳式耳机,首次提供黑、白两色选择,完美搭配各类娱乐播放设备
简介:Weproposeanewmeasurementschemefortheatom-moleculedarkstatebyusingelectromagneticallyinducedtransparency(EIT)technique.Basedonadensity-matrixformalism,wecalculatetheabsorptioncoefficientnumerically.TheappearanceoftheEITdipinthespectraprofilegivesclearevidenceforthecreationofthedarkstateintheatom-moleculeBose-Einsteincondensate.
简介:ForBose-Einsteincondensationofneutralatomsinanisotropictrapsatzerotemperature,wepresentsimpleanalyticalmethodsforcomputingthepropertiesofgroundstateandsinglevortexofBose-Einsteincondensates,andcomparethoseresultstoextensivenumericalsimulations.Thecriticalangularvelocityforproductionofvorticesiscalculatedforbothpositiveandnegativescatteringlengthsa,andfindananalyticalexpressionforthelarge-Nlimitofthevortexcriticalangularvelocityfora>0,andthecriticalnumberforcondensatepopulationapproachesthepointofcollapsefora<0,byusingapproximatevariationalmethod.