Polaronic transport and current blockades in epitaxial silicide nanowires and nanowire arrays
MSc Project: Majoranas in InAsSb-epitaxial-Al nanowires Background · PDF file ·...
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MSc Project: Majoranas in InAsSb-epitaxial-Al nanowires Background: The first detection of Majoranas in semiconductor nanowires has drawn enormous interests in condensed matter physics community [1]. Great efforts and advances have been achieved in this field over the last few years, from material growth to transport experiments and theoretical understanding. However, a fundamental question regarding whether current experimental results can be used as the “smoking-gun” evidence for the existence of Majoranas still remains controversial. This is because of the following two reasons. First, many alternative explanations have been proposed to interpret the Majorana experiments. These alternatives are difficult to be ruled out based on current experimental results. Second, many important (or even unique) behaviours predicted from the basic Majorana theory have not been observed in experiments yet. Therefore, our goal is to fully establish Majoranas by ruling out alternatives, and more importantly, by observing the predicted Majorana behaviours (e.g. quantized conductance, oscillations and correlations). The Project: One important way to improve the current Majorana experiment is to search for better semiconductor nanowire systems with larger spin-orbit coupling and larger Landé -factor. Compared to our current InSb nanowires, InAsSb nanowires are predicted to have a spin- orbit coupling that is an order of magnitude stronger, and a -factor that is 4 times larger [2]. In this project you will focus on conducting better and more convincing Majorana experiments in InAsSb-based devices. What the project offers: • Technique training of nano-fabrication, cryogenics, and low noise electronic measurement. • Working, studying and discussing the cutting-edge Majorana research. What we are looking for: Highly motivated master student who has good team collaboration. For more information about this project, please feel free to contact: Di Xu ([email protected]) and Hao Zhang ([email protected]) References: [1] V. Mourik et al. Science 336, 1003 (2012) [2] G. Winkler et al. Phys. Rev. Lett. 117, 076403 (2016)
Transcript of MSc Project: Majoranas in InAsSb-epitaxial-Al nanowires Background · PDF file ·...
MScProject:
MajoranasinInAsSb-epitaxial-Alnanowires
Background:
ThefirstdetectionofMajoranasinsemiconductornanowireshasdrawnenormousinterestsincondensedmatterphysicscommunity[1].Greateffortsandadvanceshavebeenachievedinthisfieldoverthelastfewyears,frommaterialgrowthtotransportexperimentsandtheoreticalunderstanding.However,afundamentalquestionregardingwhethercurrentexperimentalresultscanbeusedasthe“smoking-gun”evidencefortheexistenceofMajoranasstillremainscontroversial.Thisisbecauseofthefollowingtworeasons.First,manyalternativeexplanationshavebeenproposedtointerprettheMajoranaexperiments.Thesealternativesaredifficulttoberuledoutbasedoncurrentexperimentalresults.Second,manyimportant(orevenunique)behaviourspredictedfromthebasicMajoranatheoryhavenotbeenobservedinexperimentsyet.Therefore,ourgoalistofullyestablishMajoranasbyrulingoutalternatives,andmoreimportantly,byobservingthepredictedMajoranabehaviours(e.g.quantizedconductance,oscillationsandcorrelations).
TheProject:
OneimportantwaytoimprovethecurrentMajoranaexperimentistosearchforbettersemiconductornanowiresystemswithlargerspin-orbitcouplingandlargerLandé𝑔-factor.ComparedtoourcurrentInSbnanowires,InAsSbnanowiresarepredictedtohaveaspin-orbitcouplingthatisanorderofmagnitudestronger,anda𝑔-factorthatis4timeslarger[2].InthisprojectyouwillfocusonconductingbetterandmoreconvincingMajoranaexperimentsinInAsSb-baseddevices.
Whattheprojectoffers:
• Techniquetrainingofnano-fabrication,cryogenics,andlownoiseelectronicmeasurement.• Working,studyinganddiscussingthecutting-edgeMajoranaresearch.
Whatwearelookingfor:
Highlymotivatedmasterstudentwhohasgoodteamcollaboration.
Formoreinformationaboutthisproject,pleasefeelfreetocontact:DiXu([email protected])andHaoZhang([email protected])
References:
[1]V.Mouriketal.Science336,1003(2012)[2]G.Winkleretal.Phys.Rev.Lett.117,076403(2016)
