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Quantum Dots Formed in Three-dimensional Dirac Semimetal Cd3As2 Nanowires

Title
Quantum Dots Formed in Three-dimensional Dirac Semimetal Cd3As2 Nanowires
Authors
Jung, MinkyungYoshida, KenjiPark, KidongZhang, Xiao-XiaoYesilyurt, CanSiu, Zhuo BinJalil, Mansoor B. A.Park, Jin WanPark, JeungheeNagaosa, NaotoSeo, Jung PilHirakawa, Kazuhiko
DGIST Authors
Jung, MinkyungSeo, Jung Pil
Issue Date
2018-03
Citation
Nano Letters, 18(3), 1863-1868
Type
Article
Article Type
Article
Keywords
BallisticsCadmium compoundsMagnetic fieldsMagnetismMetalloidsNanocrystalsNanowiresPoint contactsQuantum chemistrySemiconductor junctionsThreshold voltageTunnel junctionsBallistic transportsCd3As2Conductance oscillationsHigh magnetic fieldsKlein TunnelingQuantum point contactStrong magnetic fieldsZero conductancesSemiconductor quantum dots
ISSN
1530-6984
Abstract
We demonstrate quantum dot (QD) formation in three-dimensional Dirac semimetal Cd3As2 nanowires using two electrostatically tuned p-n junctions with a gate and magnetic fields. The linear conductance measured as a function of gate voltage under high magnetic fields is strongly suppressed at the Dirac point close to zero conductance, showing strong conductance oscillations. Remarkably, in this regime, the Cd3As2 nanowire device exhibits Coulomb diamond features, indicating that a clean single QD forms in the Dirac semimetal nanowire. Our results show that a p-type QD can be formed between two n-type leads underneath metal contacts in the nanowire by applying gate voltages under strong magnetic fields. Analysis of the quantum confinement in the gapless band structure confirms that p-n junctions formed between the p-type QD and two neighboring n-type leads under high magnetic fields behave as resistive tunnel barriers due to cyclotron motion, resulting in the suppression of Klein tunneling. The p-type QD with magnetic field-induced confinement shows a single hole filling. Our results will open up a route to quantum devices such as QDs or quantum point contacts based on Dirac and Weyl semimetals. © 2018 American Chemical Society.
URI
http://hdl.handle.net/20.500.11750/6150
DOI
10.1021/acs.nanolett.7b05165
Publisher
American Chemical Society
Related Researcher
  • Author Seo, Jungpil Nanospm Lab(Quantum Physics Research Group)
  • Research Interests Topological Matters; High Tc Superconductors; Low dimensional Quantum Matters
Files:
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Collection:
Intelligent Devices and Systems Research Group1. Journal Articles
Department of Emerging Materials ScienceNanospm Lab(Quantum Physics Research Group)1. Journal Articles


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