石墨烯纳米带电子输运性质的声子调控机理.pdf

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1、中国科技论文在线http://www.paper.edu.cnTheelectrontransportmodulatedwithphononingraphene#nanoribbons**5Yue-YangLiu,Bo-LinLi,Shi-ZhangChen,Ke-QiuChen(SchoolofPhysicsandElectronics,HunanUniversity,Changsha,410082)Abstract:Weobservedirectlythelatticevibrationanditsmultifoldeffectonelectron/spintransportinzigz

2、aggraphenenanoribbonsinsimulation.Resultsshowthattheelectrontransportfluctuatesgreatlyduetotheincessantlatticevibrationofthenanoribbons.Moreinterestingly,thephononsbehavelikea10double-edgedswordthatitbooststheconductanceofsymmetriczigzagnanoribbons(containingevennumberofzigzagchainsalongthewidthdir

3、ection)whileweakenstheconductanceofasymmetricnanoribbons.Asaresult,thespinfiltereffectthatexistsinperfectsymmetriczigzaggraphenenanoribbonissignificantlyweakenedbyphonons.Sincephononsareusuallyinevitableinexperiments,theresearchisverymeaningfulforguidingtherealizationoftheoreticalphenomenainexperim

4、entsor15explainingthemismatchesbetweentheoreticalpredictionsandexperimentalresults.Keywords:Condensedmatterphysics;Electron-phononinteraction;Latticevibration;Electrontransport;Graphenenanoribbons0Introduction20Grapheneandgraphenenanoribbons(GNRs),whichbringusthewonderandprosperityoftwo-dimensional

5、materials,havedrawntremendousattentionfromresearchersduetotheir[1-8][9-17]distinctiveelectronicandthermalpropertiesandsoon.Zigzaggraphenenanoribbons(ZGNRs)areespeciallyattractiveinnanoelectronicsandspintronicsbecausemagneticedge[18-20]stateshavebeenfoundtobeexistattheiredges,andalotofintriguingtran

6、sportproperties25havebeenpredictedinZGNRs.Forexample,Sonetal.havedemonstratedthathalf-metallicityandspin-polarizedcurrentscanbeobtainedinZGNRsbyapplyinglateralelectricfieldsand[21]splitgates;Kimetal.reportedtheextraordinarylargemagnetoresistancesinGNR-based[22]spin-valvedevices.Impressively,Lietal.

7、findthattheelectrontransportpropertiesof[23]ZGNRsarecloselyrelatedtothesymmetryofthenanoribbonsalongthewidthdirection,30whichdividestheZGNRsintotwotypes.Later,itisfoundthatZGNRswithsymmetryalongthewidthdire