Transition to the quantum hall regime in InAs nanowire cross-junctions

Research output: Contribution to journalArticle

Abstract

We present a low-temperature electrical transport study on four-terminal ballistic InAs nanowire cross-junctions in magnetic fields aligned perpendicular to the cross-plane. Two-terminal longitudinal conductance measurements between opposing contact terminals reveal typical 1D conductance quantization at zero magnetic field. As the magnetic field is applied, the 1D bands evolve into hybrid magneto-electric sub-levels that eventually transform into Landau levels for the widest nanowire devices investigated (width = 100 nm). Hall measurements in a four-terminal configuration on these devices show plateaus in the transverse Hall resistance at high magnetic fields that scale with (ve 2/h)−1. e is the elementary charge, h denotes Planck's constant and v is an integer that coincides with the Landau level index determined from the longitudinal conductance measurements. While the 1D conductance quantization in zero magnetic field is fragile against disorder at the NW surface, the plateaus in the Hall resistance at high fields remain robust as expected for a topologically protected Quantum Hall phase.

Details

Authors
  • Johannes Gooth
  • Mattias Borg
  • Heinz Schmid
  • Nicolas Bologna
  • Marta D. Rossell
  • Stephan Wirths
  • Kirsten E. Moselund
  • Kornelius Nielsch
  • Heike Riel
Organisations
External organisations
  • IBM Research Zurich
  • University of Hamburg
  • Max Planck Institute for Chemical Physics of Solids
  • Swiss Federal Laboratories for Materials Science and Technology
  • Leibniz Institute for Solid State and Materials Research
  • Dresden University of Technology
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Nano Technology

Keywords

  • Magneto-transport, Nanowire, Conductance quantization, InAs, TASE
Original languageEnglish
Article number035028
JournalSemiconductor Science and Technology
Volume34
Publication statusPublished - 2019 Feb 25
Publication categoryResearch
Peer-reviewedYes

Total downloads

No data available