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Commensurability Oscillations in One-Dimensional Graphene Superlattices
Martin Drienovsky1, Jonas Joachimsmeyer1, Andreas Sandner1
1Institute of Experimental and Applied Physics, University of Regensburg, D-93040 Regensburg, Germany.
Physical Review Letters
|August 8, 2018
Summary
We observed commensurability oscillations in graphene superlattices, showing robust electron behavior up to 150K. This highlights the potential for advanced electronic devices despite scattering effects.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Nanotechnology
Background:
- Graphene superlattices offer tunable electronic properties.
- Understanding transport phenomena in these systems is crucial for device applications.
- Previous studies have explored various aspects of graphene-based heterostructures.
Purpose of the Study:
- To experimentally observe and characterize commensurability oscillations (COs) in one-dimensional (1D) graphene superlattices.
- To investigate the influence of periodic potential modulation on charge transport.
- To analyze the temperature dependence and scattering mechanisms in these structures.
Main Methods:
- Fabrication of hBN-encapsulated graphene superlattices with tunable periodic potential.
- Utilizing nanopatterned few-layer graphene as a local bottom gate and a global Si back gate.
- Measuring longitudinal magnetoresistance under varying gate voltages and temperatures.
Main Results:
- Pronounced commensurability oscillations (COs) were observed in the unipolar transport regime.
- Up to six CO minima were detected, indicating a long mean free path.
- Robust COs persisted up to temperatures exceeding 150 K.
- Deviations from predicted temperature dependence at high temperatures were attributed to electron-electron scattering.
Conclusions:
- Commensurability oscillations are experimentally confirmed in 1D graphene superlattices.
- Small-angle scattering is identified as the dominant scattering mechanism.
- The observed phenomena are robust at elevated temperatures, with electron-electron scattering becoming significant.
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