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Quatnum dots formed in three-dimensional Dirac-semimetal Cd3As2 nanowires

Quatnum dots formed in three-dimensional Dirac-semimetal Cd3As2 nanowires
Jung, MinkyungYoshida, KenjiJalil, MansoorNagaosa, NaotoSeo, JungpilHirakawa, Kazuhiko
DGIST Authors
Jung, MinkyungSeo, Jungpil
Issue Date
APS March Meeting 2018
Three-dimensional (3D) Dirac semimetals have attracted considerable attention owing to their exotic properties, both predicted in theory and recently demonstrated experimentally. Here, we demonstrate single quantum dots confined with two p-n junctions in 3D Dirac semimetal Cd3As2 nanowires under high magnetic fields. The device can be operated in two different regimes: (i) an n-type channel between n*-type leads underneath the source-drain contacts, creating an open regime (n*-n-n* configuration); (ii) a p-type channel in the middle of the nanowire, forming a p-type quantum dot (QD) (n*-p-n* configuration). At zero magnetic field, the quantum confinement effect vanishes in the n*-p-n* QD because the Dirac fermions penetrate p-n junctions with high transmission probability (Klein tunneling). However, the high magnetic fields bend the Dirac fermion trajectories at the p-n junction due to cyclotron motion, preventing the Klein tunneling. This results in a strong confinement at p-n junctions of Dirac materials. In this regime, the device shows clean Coulomb diamonds, indicating that a single QD is formed in a Dirac semimetal nanowire.
Related Researcher
  • Author Jung, Minkyung Quantum Nanoelectronic Devices Lab
  • Research Interests nanoelectronics, quantum transport, quantum physics, qubit, condensed matter physics,
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Division of NanotechnologyQuantum Nanoelectronic Devices Lab1. Journal Articles
Division of Nanotechnology2. Conference Papers
Department of Physics and ChemistryNanospm Lab(Advanced Materials Research Group)2. Conference Papers

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