Superfluidity in asymmetric electron hole system

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1、Superfluidityinasymmetricelectron-holesystemsIlyaGrigorenko1andRomanYa.Kezerashvili1,21PhysicsDepartment,NewYorkCityCollegeofTechnology,TheCityUniversityofNewYork,Brooklyn,NY11201,USA2TheGraduateSchoolandUniversityCenter,TheCityUniversityofNewYork,NewYork,NewYork10016,USA(Dated:June24,2014)T

2、hepairinginasystemofelectronsandholesintwospatiallyseparatedparallelplanesisstudiedinthecaseofelectron-holeasymmetrycausedbythedifferenceinthecarriersmassesandtheirchemicalpotentials.Itisfoundthatthesuperfluidstateispossibleinawiderangeoftheasymmetryparameters,becausetheasymmetriescaneffective

3、lycompensateeachother.Itispredictedthatthesystemmayexhibittwocriticaltemperaturesforsomeasymmetryparameters.Thelowercriticaltemperaturecorrespondstothesuperfluidtransitioninducedbythermalfluctuations.Intheasymmetricsystemacoexistenceofthenormalandsuperfluidstatesispossibleevenatzerotemperature

4、.Superfluidtransitioninsystemsoftwoparallelplanesproton-neutronasymmetrydestroysthesuperfluidstate,withspatiallyseparatedelectronsandholeshasbeenwhenthechemicalpotentialdifferencebecomescompa-asubjectofinterestformanyyears1–5.Dragcurrentsrabletothemagnitudeoftheorderparameterintheandzerocharge

5、dipolarcurrentwerepredictedinsuchsystem.systems2,3.InspatiallyseparatedsystemofelectronsInthisworkwestudyanelectron-holesystem,whereandholesintwoparallelplanesthechemicalpotentialstheelectronsresideinatwo-dimensionallayerandtheandthemassofthepositiveandnegativecarrierscanbeholesinanothertwo

6、-dimensionallayer,whichcanex-controlledindependently,makingthemagoodtestbedhibitsuperfluidityinaverywiderangeoftheelectron-forstudiesoftheelectron-holeasymmetryonthefor-holemassandchemicalpotentialasymmetry.Weshowmationofthesuperfluidstate.Itiscommonthatinthatthesuperfluidstatesurvivesbecauset

7、heelectron-chemicallydopedsemiconductorsystemsthepositiveandholemassasymmetrycanbeeffectivelycompensatedbynegativechargecarriersmayhaveverydifferenteffectivethechemicalpotentialdifference.Wealsopredictthatmasses.Theratiobetweentheelectronandholemassesatzerot