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1、DepolarizationofElectronicSpinQubitsConfinedinSemiconductorQuantumDots.DanCogan,1OdedKenneth,1NetanelH.Lindner,1GioraPeniakov,1CasparHopfmann,1DanDalacu,2PhilipJ.Poole,2PawelHawrylak,3andDavidGershoni1,∗1ThePhysicsDepartmentandtheSolidStateInstitute,Technion–IsraelInstituteofTechnology,3200003Hai
2、fa,Israel2NationalResearchCouncilofCanada,Ottawa,Ontario,CanadaK1A0R63PhysicsDepartment,UniversityofOttawa,ON,CanadaONCanadaK1N6N5Quantumdotsarearguablythebestinterfacebetweenmatterspinqubitsandflyingphotonicqubits.Usingquantumdotdevicestoproducejointspin-photonicstatesrequirestheelectronicspinqu
3、bitstobestoredforextendedtimes.Therefore,thestudyofthecoherenceofspinsofvariousquantumdotconfinedchargecarriersisimportantbothscientificallyandtechnologically.Inthisstudywereportonspinrelaxationmeasurementsperformedonfivedifferentformsofelectronicspinqubitsconfinedintheverysamequantumdot.Inparticular
4、,weuseallopticaltechniquestomeasurethespinrelaxationoftheconfinedheavyholeandthatofthedarkexciton–alonglivedelectron-heavyholepairwithparallelspins.Ourmeasuredresultsforthespinrelaxationoftheelectron,theheavy-hole,thedarkexciton,thenegativeandthepositivetrions,intheabsenceofexternallyappliedmagne
5、ticfield,areinagreementwithacentralspintheorywhichattributesthedephasingofthecarriers’spintotheirhyperfineinteractionswiththenuclearspinsoftheatomsformingthequantumdots.Wedemonstratethattheheavyholedephasesmuchslowerthantheelectron.Wealsoshow,bothexperimentallyandtheoretically,thatthedarkexcitonde
6、phasesslowerthantheheavyhole,duetotheelectron-holeexchangeinteraction,whichpartiallyprotectsitsspinstatefromdephasing.I.INTRODUCTIONInthisworkwecomprehensivelystudy,bothexper-imentallyandtheoretically,thedephasingdynamicsofTheelectronicspininsemiconductornanostructuresQDconfinedelectronicspinsin5
7、differentforms:a)canoftenbedescribedasanisolatedphysicaltwolevelconductionbandelectron,b)valencebandheavy-hole,system.Assuchithaslongbeenconsideredanex-c)negativetrion,d)positivetrion,ande)darkexcitoncellentqubitwithgreatpote
