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Imaging fractional incompressible stripes in integer quantum Hall systems.
Nicola Paradiso1, Stefan Heun, Stefano Roddaro
1NEST, Istituto Nanoscienze-CNR and Scuola Normale Superiore, Pisa, Italy.
Physical Review Letters
|September 26, 2012
Summary
Fractional features were observed in all integer quantum Hall constrictions studied using scanning-gate microscopy. This provides evidence for fractional substructures within integer edge states, supporting edge-reconstruction theory.
Area of Science:
- Condensed Matter Physics
- Quantum Hall Effect
Background:
- Conflicting experimental evidence exists regarding fractional order in integer quantum Hall systems.
- Integer edge states are sometimes viewed as monolithic, lacking inner structure, while other studies suggest fractional substructures.
Purpose of the Study:
- To investigate the spatial features of integer quantum Hall edge systems using advanced low-temperature scanning probe techniques.
- To unambiguously determine the presence of fractional features within integer quantum Hall constrictions.
Main Methods:
- Utilized low-temperature scanning probe techniques, specifically scanning-gate microscopy.
- Studied integer quantum Hall constrictions to probe edge state properties.
Main Results:
- Fractional features were unambiguously observed in every integer quantum Hall constriction examined.
- Provided experimental estimates for the width of fractional incompressible stripes at various filling factors (1/3, 2/5, 3/5, 2/3).
Conclusions:
- The findings confirm the existence of fractional substructures within integer quantum Hall edge states.
- The experimental results align well with predictions from the edge-reconstruction theory.
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