2008/01/28 by J. Nagel, David Speer, D. Speer +10 · 1 citation
Physics and Astronomy · #Amplitude #Brownian motion #Condensed matter physics #Current (fluid) #Force Microscopy Techniques and Applications #Josephson effect #Materials science #Mechanical and Optical Resonators #Microwave #Negative resistance #Physics #Pi Josephson junction #Quantum mechanics #Range (aeronautics) #Realization (probability) #Superconductivity #Voltage #nlin.CD #stochastic dynamics and bifurcation
paper · pdf · doi:10.1103/physrevlett.100.217001
4 pages, 3 figures, submitted to Physical Review
arxiv created 2008/01/28 · openalex publication_date 2008/05/29 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We experimentally demonstrate the occurrence of negative absolute resistance (NAR) up to about \ensuremath-1 \ensuremathΩ in response to an externally applied dc current for a shunted Nb\mathrm\text\ensuremath-Al/AlOx\mathrm\text\ensuremath-Nb Josephson junction, exposed to a microwave current at frequencies in the GHz range. The realization (or not) of NAR depends crucially on the amplitude of the applied microwave current. Theoretically, the system is described by means of the resistively and capacitively shunted junction model in terms of a moderately damped, classical Brownian particle dynamics in a one-dimensional potential. We find excellent agreement of the experimental results with numerical simulations of the model.