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We fabricated graphene devices in a unique Corbino geometry, achieving high mobility and improved quantum Hall effect measurements. This study reveals new insights into fractional quantum Hall states and potential electron solid phases.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Graphene exhibits unique electronic properties relevant for advanced electronic devices.
  • Corbino geometry offers an alternative to traditional Hall bar devices for studying electronic transport.
  • Quantum Hall effect (QHE) in graphene reveals fundamental physics and potential applications.

Purpose of the Study:

  • To fabricate graphene devices in a Corbino geometry.
  • To achieve high device mobility using advanced encapsulation and gating techniques.
  • To investigate the quantum Hall effect in this geometry and compare it with Hall bar devices.

Main Methods:

  • Fabrication of graphene devices utilizing a Corbino geometry with concentric electrodes.
  • Implementation of boron nitride encapsulation and a dual-graphite gate structure for high mobility.
  • Conductance measurements in the quantum Hall effect regime.

Main Results:

  • Demonstrated high device mobility in graphene Corbino devices.
  • Achieved superior bulk conductance measurements in the QHE regime compared to Hall bar devices.
  • Observed improved resolution for both integer and fractional QHE states.
  • Identified apparent phase transitions in fractional sequences and features of electron solid phases in higher Landau levels.

Conclusions:

  • Graphene Corbino geometry devices fabricated with boron nitride encapsulation and dual-graphite gates exhibit high mobility and enable enhanced QHE measurements.
  • The study provides new insights into fractional QHE states and electron solid phases in graphene.
  • Corbino geometry devices offer advantages for fundamental studies of electronic properties in 2D materials.