TY - JOUR
T1 - Static and dynamic properties of annular Josephson junctions with injected current
AU - Perez De Lara, D.
AU - Lisitskiy, M. P.
AU - Nappi, C.
AU - Cristiano, R.
N1 - Copyright:
Copyright 2008 Elsevier B.V., All rights reserved.
PY - 2006
Y1 - 2006
N2 - We have investigated theoretically and experimentally a small annular Josephson junction with three leads, where the third lead is added to one of the ring-shaped electrodes to apply a control (injection) current and thereby create a local magnetic field. We study the static case, namely, we derive the general expression for the Josephson critical current in the presence of both an injection current and an external parallel magnetic field. Concerning the theoretical investigation of the dynamic case, we obtain an analytical expression for the Fiske steps amplitude as a function of the injection current intensity and the angle separating the two injection leads (θ1). The theoretical results show that a perfect analogy with the behavior of a rectangular junction in an external uniform magnetic field can be established for any orientation of the injector leads in the static case, while in the dynamic case the analogy holds only when the injector leads have a separation angle of θ1 =π. We present experimental dependences of the Josephson critical current and Fiske steps amplitudes on the injected current for two separation angles θ1 =π 2 and θ1 =π. The analysis and the comparison with the experiments confirm the theoretical predictions. The Fiske step measurements, presented for the case θ1 =π 2, have no straightforward analogous for the rectangular junction; however, we show a very good agreement between theory and experiments also in this case.
AB - We have investigated theoretically and experimentally a small annular Josephson junction with three leads, where the third lead is added to one of the ring-shaped electrodes to apply a control (injection) current and thereby create a local magnetic field. We study the static case, namely, we derive the general expression for the Josephson critical current in the presence of both an injection current and an external parallel magnetic field. Concerning the theoretical investigation of the dynamic case, we obtain an analytical expression for the Fiske steps amplitude as a function of the injection current intensity and the angle separating the two injection leads (θ1). The theoretical results show that a perfect analogy with the behavior of a rectangular junction in an external uniform magnetic field can be established for any orientation of the injector leads in the static case, while in the dynamic case the analogy holds only when the injector leads have a separation angle of θ1 =π. We present experimental dependences of the Josephson critical current and Fiske steps amplitudes on the injected current for two separation angles θ1 =π 2 and θ1 =π. The analysis and the comparison with the experiments confirm the theoretical predictions. The Fiske step measurements, presented for the case θ1 =π 2, have no straightforward analogous for the rectangular junction; however, we show a very good agreement between theory and experiments also in this case.
UR - http://www.scopus.com/inward/record.url?scp=33745577255&partnerID=8YFLogxK
U2 - 10.1103/PhysRevB.73.214530
DO - 10.1103/PhysRevB.73.214530
M3 - 文章
AN - SCOPUS:33745577255
VL - 73
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
SN - 1098-0121
IS - 21
M1 - 214530
ER -