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Escape dynamics in moderately damped Josephson junctions (Review Article)
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10.1063/1.3699625
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    Affiliations:
    1 Dip. Scienze Fisiche, Universitá di Napoli Federico II, Piazzale Tecchio 80, Napoli 80125, Italy and CNR-SPIN, UOS Napoli, Monte S. Angelo via Cinthia, Napoli 80126, Italy
    2 Department of Physics and Astronomy, Dartmouth College, Hanover New Hampshire 03755, USA
    3 Dip. Scienze Fisiche, Universitá di Napoli Federico II, Piazzale Tecchio 80, Napoli 80125, Italy and CNR-SPIN, UOS Napoli, Monte S. Angelo via Cinthia, Napoli 80126, Italy
    4 NEST and Scuola Normale Superiore, Piazza San Silvestro 12, I-56127 Pisa, Italy
    5 Dip. Scienze Fisiche, Universitá di Napoli Federico II, Piazzale Tecchio 80, Napoli 80125, Italy and CNR-SPIN, UOS Napoli, Monte S. Angelo via Cinthia, Napoli 80126, Italy
    6 Dip. Ingegneria dell’Informazione, Seconda Universitá di Napoli, via Roma 29, Aversa (CE) 81031, Italy
    7 Dip. Scienze Fisiche, Universitá di Napoli Federico II, Piazzale Tecchio 80, Napoli 80125, Italy and CNR-SPIN, UOS Napoli, Monte S. Angelo via Cinthia, Napoli 80126, Italy
    8 Dip. Ingegneria dell’Informazione, Seconda Universitá di Napoli, via Roma 29, Aversa (CE) 81031, Italy; CNR-SPIN, UOS Napoli, Monte S. Angelo via Cinthia, Napoli 80126, Italy; and Dip. Scienze Fisiche, Universitá di Napoli Federico II, Piazzale Tecchio 80, Napoli 80125, Italy
    a) Email: tafuri@na.infn.it
    Low Temp. Phys. 38, 263 (2012); http://dx.doi.org/10.1063/1.3699625
/content/aip/journal/ltp/38/4/10.1063/1.3699625
http://aip.metastore.ingenta.com/content/aip/journal/ltp/38/4/10.1063/1.3699625

Figures

Image of FIG. 1.
FIG. 1.

(a) 3-dim view of wash-board potential in the RSJ model as a function of the phase and of the bias current. The current spans from 0 to Ic . In (b) EJ is half of the value used in (a), and this favors phase diffusion regime (see text). (c) A 2-dim cut from (b) for a fixed value of the current. TA stands for thermal activation (black dotted line), while MQT for macroscopic quantum tunneling (red dotted line). Once the particle/phase overcomes the barrier, it rolls in the running state. Retrapping processes may happen for intermediate levels of dissipation determining a phase diffusion (PD) regime.

Image of FIG. 2.
FIG. 2.

Schematic representation of SCD measurements from the thermal regime to macroscopic quantum tunneling.

Image of FIG. 3.
FIG. 3.

Switching current probability distribution at H = 0 (a) and H = 6.09 G (b) of a NbN/MgO/NbN JJ (Refs. 62 and 63).

Image of FIG. 4.
FIG. 4.

Top frame: temperature dependence of the standard deviation σ of the switching distributions for H = 0 G (squares) and H = 6.09 G (circles) shown in Fig. 3. Bottom frame: a numerical simulation of the data. In the inset escape rates (symbols) as a function of the barrier height at zero magnetic field for temperatures near T* are shown, together with numerical simulations (dashed lines).

Image of FIG. 5.
FIG. 5.

Schematic representation of SCD measurements in the case of direct transition from MQT to phase diffusion regime.

Tables

Generic image for table
Table I.

Comparison of device parameters.

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/content/aip/journal/ltp/38/4/10.1063/1.3699625
2012-04-27
2014-04-17
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Escape dynamics in moderately damped Josephson junctions (Review Article)
http://aip.metastore.ingenta.com/content/aip/journal/ltp/38/4/10.1063/1.3699625
10.1063/1.3699625
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