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Many superconducting micro- and nano-electronic devices operating at low temperatures suffer from the presence of non-equilibrium quasiparticles. The number of these quasiparticles increases rapidly with the increase in the operation frequencies above the threshold determined by the relaxation rate.
Event Time
3pm-4pm
Venue
C36 Physics
Speaker
Dr. Ivan Khaimovich, Max Planck Institute for Physics of Complex Systems Condensed Matter
Join us to meet Physics researchers and talk about whatever you're working on or would like to work on in the future, including summer/undergraduate research projects. Refreshments will be provided and everyone is welcome!
Event Time
13:00 - 14:00
Venue
C36, Physics
Neutrinos with ANNIE & WATCHMAN
Event Time
13:45 - 14:45
Venue
Physics C36
Speaker
Matthew Malek, Sheffield
The shot noise is originated from the granularity of the particles. However, in tunnelling devices with negligible level spacing, the noise in tunnelling current induced by particle-environment interaction is classified as thermal rather than shot noise. We argue that for systems with the level spacing much greater than the thermal energy, the particle interacting with the environment can induce a new class of shot noise. Here, we consider phase particle tunnelling induced shot noise in Josephson junctions. Specifically, these phase particles tunnel between neighbouring washboard potential valleys in which the energy level separations is defined by the Josephson plasma frequency, and the shot noise would reveal in the measured voltage noise. We investigate theoretically and experimentally the environment-induced voltage shot noise in current biased Josephson junctions. A universal form of the zero-frequency noise spectrum is obtained, which exhibits a quadratic dependence on the mean voltage in small bias region. The quadratic dependence is verified experimentally on junctions covering a wide range of parameters, and is found also in junction arrays of various array sizes.
Event Time
3pm-4pm
Venue
C36 Physics
Speaker
Dr. Chii-Dong Chen, Institute of Physics, Academia Sinica, Taipei, Taiwan
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Day | Week | Month | Year | Upcoming