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Quantum Dots Formed in Three-dimensional Dirac Semimetal Cd3As2 Nanowires
Minkyung Jung1, Kenji Yoshida2, Kidong Park3
1DGIST Research Institute, DGIST , 333 TechnoJungang, Hyeonpung , Daegu 42988 , Korea.
Nano Letters
|February 24, 2018
Summary
We demonstrate quantum dot (QD) formation in Dirac semimetal nanowires using electrostatic gates and magnetic fields. This breakthrough enables new quantum devices by controlling electron behavior in these unique materials.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Quantum Phenomena
Background:
- Three-dimensional Dirac semimetals like Cd3As2 possess unique electronic properties.
- Quantum dots (QDs) are crucial for quantum computing and electronics.
- Controlling QD formation in novel materials is an active research area.
Purpose of the Study:
- To demonstrate the formation of quantum dots (QDs) in three-dimensional Dirac semimetal Cd3As2 nanowires.
- To investigate the role of electrostatic tuning and magnetic fields in QD formation.
- To explore the potential of Dirac semimetals for future quantum devices.
Main Methods:
- Fabrication of Cd3As2 nanowire devices with two electrostatically tuned p-n junctions.
- Measurement of linear conductance as a function of gate voltage under high magnetic fields.
- Analysis of Coulomb diamond features to confirm QD formation.
Main Results:
- Successful demonstration of quantum dot (QD) formation in Cd3As2 nanowires.
- Observed suppression of conductance at the Dirac point with strong conductance oscillations.
- Evidence of a clean single QD exhibiting Coulomb diamond features.
- Formation of a p-type QD between n-type leads, with magnetic field-induced confinement.
- Suppression of Klein tunneling due to resistive tunnel barriers formed by cyclotron motion.
Conclusions:
- Quantum dot formation is achievable in Dirac semimetal Cd3As2 nanowires.
- Gate and magnetic fields effectively control QD formation and properties.
- This work paves the way for novel quantum devices based on Dirac and Weyl semimetals.
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