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Pré-Publication, Document De Travail Année : 2006

BLOCH OSCILLATIONS IN A JOSEPHSON CIRCUIT

N. Boulant
  • Fonction : Auteur
G. Ithier
  • Fonction : Auteur
F. Nguyen
  • Fonction : Auteur
Patrice Bertet
  • Fonction : Auteur
H. Pothier
  • Fonction : Auteur
  • PersonId : 833203
Denis Vion
  • Fonction : Auteur
C. Urbina
Daniel Esteve
  • Fonction : Auteur

Résumé

Bloch oscillations predicted to occur in current-biased single Josephson junctions have eluded direct observation up to now. Here, we demonstrate similar Bloch oscillations in a slightly richer Josephson circuit, the quantronium. The quantronium is a Bloch transistor with two small junctions in series, defining an island, in parallel with a larger junction. In the ground state, the microwave impedance of the device is modulated periodically with the charge on the gate capacitor coupled to the transistor island. When a current flows across this capacitor, the impedance modulation occurs at the Bloch frequency , which yields Bloch sidebands in the spectrum of a reflected continuous microwave signal. We have measured this spectrum, and compared it to predictions based on a simple model for the circuit. We discuss the interest of this experiment for metrology and for mesoscopic physics.
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Dates et versions

hal-00023624 , version 1 (02-05-2006)

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N. Boulant, G. Ithier, F. Nguyen, Patrice Bertet, H. Pothier, et al.. BLOCH OSCILLATIONS IN A JOSEPHSON CIRCUIT. 2006. ⟨hal-00023624⟩
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