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Flux quantization effects in InN nanowires.

Thomas Richter1, Christian Blömers, Hans Lüth

  • 1Institute of Bio- and Nanosystems (IBN-1) and JARA-FIT Julich-Aachen Research Alliance, Forschungszentrum Julich, 52425 Julich, Germany.

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Summary

Carrier transport in Indium Nitride (InN) nanowires occurs in a surface electron gas. Magnetotransport measurements reveal oscillations linked to magnetic flux penetrating circular quantum states, not Aharonov-Bohm interference.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Indium Nitride (InN) nanowires are promising for electronic applications.
  • Understanding carrier transport mechanisms in nanowires is crucial for device optimization.
  • Surface electron gas transport is a key phenomenon in low-dimensional semiconductor structures.

Purpose of the Study:

  • To investigate carrier transport in InN nanowires using magnetotransport measurements.
  • To elucidate the nature of magnetoconductance oscillations observed in these nanowires.
  • To determine the underlying physical mechanisms responsible for the observed transport phenomena.

Main Methods:

  • Plasma-enhanced molecular beam epitaxy (PEMBE) for InN nanowire growth.
  • Temperature-dependent electrical transport measurements.
  • Magnetotransport measurements under an axially oriented magnetic field.

Main Results:

  • Carrier transport predominantly occurs in a tube-like surface electron gas.
  • Pronounced magnetoconductance oscillations were observed in InN nanowires.
  • Oscillation periodicity corresponds to a single magnetic flux quantum, attributed to flux penetration into coherent circular quantum states.

Conclusions:

  • The study confirms surface electron gas as the primary transport channel in InN nanowires.
  • The observed oscillations are explained by magnetic flux effects on phase-coherent circular states, highlighting the role of quantum mechanics in nanowire transport.
  • The high crystalline quality of PEMBE-grown InN nanowires facilitates the existence of these phase-coherent states.