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Nonlinear quasiparticle tunneling between fractional quantum hall edges
Stefano Roddaro1, Vittorio Pellegrini, Fabio Beltram
1NEST-INFM and Scuola Normale Superiore, I-56126 Pisa, Italy.
Physical Review Letters
|February 7, 2003
Summary
Nonlinear tunneling conductance in fractional quantum Hall states reveals temperature-dependent peaks and symmetric width behavior around nu=1/2, consistent with quasiparticle tunneling theories.
Area of Science:
- Condensed Matter Physics
- Quantum Hall Effect
- Mesoscopic Physics
Background:
- Fractional quantum Hall effect (FQHE) exhibits exotic electronic states with fractionally charged quasiparticles.
- Edge states in FQHE systems are crucial for understanding transport phenomena.
- Weak-backscattering regime allows for sensitive probing of tunneling processes.
Purpose of the Study:
- Investigate nonlinearities in differential tunneling conductance between FQHE edge states.
- Characterize the temperature dependence of tunneling conductance in the nu=1/3 state.
- Analyze the behavior of tunneling width in the 2/3 <= nu <= 1/3 fractional quantum Hall regime.
Main Methods:
- Measurement of differential tunneling conductance at a constriction in FQHE systems.
- Systematic variation of temperature and filling factor (nu).
- Analysis of peak development and width in tunneling conductance.
Main Results:
- Observed remarkable nonlinearities in differential tunneling conductance.
- A temperature-dependent peak in the nu=1/3 state, with width determined by fractional charge.
- Symmetric behavior of the tunneling width around nu=1/2 for 2/3 <= nu <= 1/3.
Conclusions:
- The observed nonlinearities and temperature dependence are consistent with theoretical predictions.
- Results support the model of interedge quasiparticle tunneling in the weak-backscattering regime.
- Provides experimental evidence for the role of fractional charge in tunneling characteristics.