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Article Dans Une Revue Physical Review Letters Année : 2007

The relaxation time of a chiral quantum R-L circuit

Résumé

We report on the GHz complex admittance of a chiral one dimensional ballistic conductor formed by edge states in the quantum Hall regime. The circuit consists of a wide Hall bar (the inductor L) in series with a tunable resistor (R) formed by a quantum point contact. Electron interactions between edges are screened by a pair of side gates. Conductance steps are observed on both real and imaginary parts of the admittance. Remarkably, the phase of the admittance is transmission-independent. This shows that the relaxation time of a chiral R-L circuit is resistance independent. A current and charge conserving scattering theory is presented that accounts for this observation with a relaxation time given by the electronic transit time in the c cuit.
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Dates et versions

hal-00126930 , version 1 (26-01-2007)
hal-00126930 , version 2 (14-05-2007)

Identifiants

Citer

Julien Gabelli, Gwendal Fève, Takis Kontos, Jean-Marc Berroir, Bernard Plaçais, et al.. The relaxation time of a chiral quantum R-L circuit. Physical Review Letters, 2007, 98, pp.166806. ⟨10.1103/PhysRevLett.98.166806⟩. ⟨hal-00126930v2⟩
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