简介：Wereviewrecentadvancesinthefieldofquantumdotlasersonsilicon.Asummaryofdeviceperformance,reliability,andcomparisonwithsimilarquantumwelllasersgrownonsiliconwillbepresented.Weconsiderthepossibilityofscalable,lowsize,weight,andpowernanolasersgrownonsiliconenabledbyquantumdotactiveregionsforfutureshort-reachsiliconphotonicsinterconnects.

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简介：Weproposeaschemetoengineeranon-localtwo-qubitphasegatebetweentworemotequantum-dotspins.Alongwithone-qubitlocaloperations,onecaninprincipalperformvarioustypesofdistributedquantuminformationprocessing.Theschemeemploysaphotonwithlinearlypolarisationinteractingoneaftertheotherwithtworemotequantum-dotspinsincavities.Duetotheopticalspinselectionrule,thephotonobtainsaFaradayrotationaftertheinteractionprocess.Bymeasuringthepolarisationofthefinaloutputphoton,anon-localtwo-qubitphasegatebetweenthetworemotequantum-dotspinsisconstituted.Ourschememayhasveryimportantapplicationsinthedistributedquantuminformationprocessing.

简介：我们调查一个戒指系统联合到在一个维的拓扑的超导体nanowire的结束限制的二个Majorana界限状态的一个量点(QD)填写了的电子运输里面。由调节通过戒指穿的磁性的流动，当nanowire在它的拓扑的阶段时，我们考虑的模型系统能被交换进状态与或没有零精力的模式。我们发现在传导力光谱的Fano侧面为这二种不同状况由于在界限和连续统状态之间的干扰展出显著地不同的特征，它能因而被用来检测Majorana零精力的模式。作为磁性的流动的一个周期的函数，最有趣地，传导力看2频率二个Majorana界限状态什么时候是nonoverlapping(是在无穷地长的nanowire)但是当重叠成为非零时，显示4频率(作为在有限长度nanowire)。我们在Majorana费米子表示印射模型系统进一枚QD-Kitaev戒指并且由检查精力光谱肯定这些不同特征。

简介：Low-lyingstatesofaverticallycoupledthree-layerquantum-dotsystemarestudied.Eachlayercontainsoneelectron,andthetunnellingofelectronsbetweenlayersisneglected.EffectsoftheinterlayerseparationdandtheexternalmagneticfieldBareevaluatedbynumericalcalculations.Inthestrongcouplingcase(i.e.dissmall),asinasingledot,transitionsoftheangularmomentumLofthetruegroundstatesoccurwhenBincreases,whereasintheweakcouplingcasethetransitiondoesnotoccurandLremainszero.Furthermore,itisfoundthatthevariationofdmayalsoinducetheLtransition.Asaresult,aphasediagramofLofthetruegroundstateisgiveninthed-Bplane.

简介：Theeffectsofthemagneticfieldonthevalencebondpropertyofthedouble-quantum-dotmoleculearenumericallystudiedbythefiniteelementmethodandperturbationapproachbecauseoftheabsenceofcylindricalsymmetryinthehorizontallycoupleddots.Thecalculationresultsshowthattheenergyvalueofthegroundstatechangesdifferentlyfromthatofthefirstexcitedstatewithincreasingmagneticfieldstrength,andtheycrossunderacertainmagneticfield.Theincreasingmagneticfieldmakesthecovalentbondstatechangeintoanionicbondstate,whichagreesqualitativelywithexperimentalresultsandandmakesionicbondstatesremain.Theoscillatorstrengthoftransitionbetweencovalentbondstatesdecreasesdistinctlywiththeincreasingmagneticfieldstrength,whenthemoleculeisirradiatedbypolarizedlight.Suchaphenomenonispossiblyusefulforactualapplications.

简介：吸收系列和折射索引变化在一个核心/壳量点为激子理论上被计算。我们的方法论的优点是一个人能由在监禁潜力改变二个参数调查排斥核心的影响。光吸收上的激子量点的维数效果被学习了。在一样的政体，激子的光吸收紧张比为二维的量戒指为核心/壳量点是小得多的，这被发现了。线性并且非线性的光吸收系数和折射索引变化与监禁潜力的变化被检验了。结果证明光吸收和折射索引变化被核心/壳量点的排斥核心强烈影响。而且，计算结果也表明作为内部半径增加，山峰系数和激子的折射索引变化将显示出的吸收珍视在核心/壳量点的光Aharonov-Bohm摆动。

简介：Inthepresentpaper,weshallrigorouslyre-establishtheresultofthesingle-particlefunctionofaquantumdotsystematfinitetemperature.Unliketheproofgiveninourpreviouswork(Phys.Rev.B74195414(2006)),wetakeadifferentapproach,whichdoesnotexploittheexplicitexpressionoftheGibbsdistributionfunction.Instead,weonlyassumethatthestatisticaldistributionfunctionofthequantumdotsystemisthermodynamicallystable.Asaresult,weareabletoshowclearlythattheelectronicstructureinthequantumdotsystemiscompletelydeterminedbyitsthermodynamicstability.Furthermore,theweakerrequirementsonthestatisticaldistributionfunctionalsomakeitpossibletoapplythesamemethodtothequantumdotsystemsinnon-equilibriumstates.

简介：Weinvestigatethedynamicsoftwointeractionelectronsconfinedtoone-dimensionalquantumdotarrayinanacelectricfield.Wefindthatinitiallylocalizedelectronswillremainlocalizedintheabsenceofcoulombinteractioniftheratiooftheacfieldmagnitudetothefrequencyisarootoftheordinaryzero-orderBesselfunction.IncontrasttothecasewithoutCoulombinteraction,nomatterwhatthevalueis,theelectronsaredelocalizedandthedelocalizationeffectdependsontheratioU/ωandeaE/ω,whereUisthestrengthofCoulombinteraction,aisthelatticeconstant,andEandωaretheacfieldamplitudeandfrequency,respectively.

简介：我们采用nonequilibrium格林的函数方法理论上在一个使变形的分子学习Kondo效果，它被当作一个电子声子相互作用(EPI)系统。为声子部分的自我精力在标准许多身体被计算图解的扩大直到在EPI力量的第二份订单。我们发现多重帮助声子的Kondo卫星除平常的Kondo回声以外产生。在反平行的磁性的配置切开主要Kondo山峰和帮助声子的卫星仅仅发生因为不均匀的点铅couplings，而是它从为平行磁性的配置的对称是免费的。EPI力量和震动的频率能提高主要Kondo和卫星切开的旋转。压制的零偏爱的Kondo回声能被使用一个外部磁场恢复，这被显示出，其大小显著地依赖于phononic效果。尽管在隧道联合的不对称现象没有贡献到Kondo山峰切开的纺纱的恢复，它能缩小需要交换在大否定剧降和大积极山峰之间的通道磁致电阻比率的外部地。

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简介：Accordingtothewell-establishedlight-to-electricityconversiontheory,resonantexcitedcarriersinthequantumdotswillrelaxtothegroundstatesandcannotescapefromthequantumdotstoformphotocurrent,whichhavebeenobservedinquantumdotswithoutap–njunctionatanexternalbias.Here,weexperimentallyobservedmorethan88%oftheresonantlyexcitedphotocarriersescapingfromInAsquantumdotsembeddedinashort-circuitedp–njunctiontoformphotocurrent.Thephenomenoncannotbeexplainedbythermionicemission,tunnelingprocess,andintermediate-bandtheories.Anewmechanismissuggestedthatthephotocarriersescapedirectlyfromthequantumdotstoformphotocurrentratherthanrelaxtothegroundstateofquantumdotsinducedbyap–njunction.Thefindingisimportantforunderstandingthelow-dimensionalsemiconductorphysicsandapplicationsinsolarcellsandphotodiodedetectors.

简介：由交流在一个量点分子为激子包含本地化和纠纷的现象的Schroedinger方程电的Seld是调查的经分解。Schroedinger方程的新准确系列解决方案第一次被获得了。分析表情能进一步在交流下面在一个双联合的量点分子描述交往的电子洞对的动态行为电Geldaccurately。

简介：在在一个抛物线的量点强壮联合的electric-LO声子的条件上，我们获得地面状态和第一激动的状态的eigenenergy，地面状态的特徵函数并且第一--由使用Pekar的变化方法的激动的状态类型。在量点的这个系统可以作为二水平的量system-qubit被采用。当电子处于地面的重叠状态时--并且第一激动的状态，我们获得电子密度的时间进化。库仑有约束力的参数上的电子的概率密度的关系和库仑有约束力的参数，经常的联合的electron-LO-phonon和监禁长度上的摆动的时期的关系被导出。

简介：用运动技术的一个方程，我们通过AndersonHamiltonian联合到铁磁性的领先和一枚mesoscopic戒指的一个量点调查极化纺纱的运输。我们在平衡和nonequilibrium案例分析这个系统的传动概率，并且我们的结果表明运输性质显示出在mesoscopic戒指取决于极化纺纱的强度p，磁性的流动和格子地点NR的数字的一些显著特征。这些效果可能在spintronics有一些潜在的应用。

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简介：Thecoherentlight-matterinteractionhasdrawnanenormousamountofattentionforitsfundamentalimportanceinthecavityquantum-electrodynamics(C-QED)fieldandgreatpotentialinquantuminformationapplications.Here,wedesignahybridC-QEDsystemconsistingofaquantumdot(QD)drivenbytwo-tonefieldsimplantedinaphotoniccrystal(PhC)cavitycoupledtoanauxiliarycavitywithasingle-modewaveguideandinvestigatethehybridsystemoperatingintheweak,intermediate,andstrongcouplingregimesofthelight-matterinteractionviacomparingtheQD-photoninteractionwiththedipoledecayrateandthecavityfielddecayrate.Theresultsindicatethattheauxiliarycavityplaysakeyroleinthehybridsystem,whichaffordsaquantumchanneltoinfluencetheabsorptionoftheprobefield.BycontrollingthecouplingstrengthbetweentheauxiliarycavityandthePhCcavity,thephenomenonoftheMollowtripletcanappearintheintermediatecouplingregime,andevenintheweakcouplingregime.WefurtherstudythestrongcouplinginteractionmanifestedbyvacuumRabisplittingintheabsorptionwithmanipulatingthecavity-cavitycouplingunderdifferentparameterregimes.ThisstudyprovidesapromisingplatformforunderstandingthedynamicsofQD-C-QEDsystemsandpavingthewaytowardon-chipQD-basednanophotonicdevices.

简介：Quantumdots(QDs)canachievehighquantumyieldsclosetounityinliquidsolutions,whereastheyexhibitadecreasedconversionefficiencyafterbeingintegratedintosolid-statepolymermatricesforlight-emittingdiode(LED)devices,whichiscalledthehostmatrixeffect.Inthisstudy,weproposeasolid–liquidhybrid-stateQD-LEDtosolvethisissue.Theethylene-terminatedpolydimethylsiloxane(ethylene-PDMS)isusedtoestablishasolid-statecross-linkednetwork,whereasthemethyl-terminatedPDMS(methyl-PDMS)isusedinitsliquidstate.Fromamacroscopiclevel,thecuredsolid–liquidhybrid-statePDMS(SLHP)compositesreachasolidstate,whichisstableandflexibleenoughtobeusedinLEDdevices.ComparedwithLEDsusingconventionalQD/solidPDMScompositesatequalcolorconversionefficiencyrangingfrom40%to60%,theluminousfluxofLEDswithQD/SLHPcompositesisincreasedby13.0%usinganoptimizedmethyl-PDMSconcentrationof85wt.%.Asaresult,highefficiencyQD-LEDsusingQDsastheonlycolorconvertorwithluminousefficacyof89.6lm/W(0.19A)wereachieved,whichshowaworkingstabilitycomparablewiththatusingconventionalsolid-statestructuresataharshcondition.Consequently,thenovelapproachshowsgreatpotentialforachievinghighefficiencyandhighstabilityQD-LEDs,whichisalsocompatiblewithcurrentstructuresusedinilluminationanddisplayapplications.